Add TypeScript types for ExtensionError and improve error handling

- Add SerializedExtensionError TypeScript bindings from Rust
- Add ExtensionErrorCode enum export with ts-rs
- Create useExtensionError composable with type guards and error message extraction
- Fix developer page toast messages to show proper error messages instead of [object Object]
- Add getErrorMessage helper function for robust error handling across different error types

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -23,9 +23,9 @@
     "@nuxt/icon": "2.0.0",
     "@nuxt/ui": "4.1.0",
     "@nuxtjs/i18n": "10.0.6",
-    "@pinia/nuxt": "^0.11.2",
-    "@supabase/supabase-js": "^2.79.0",
-    "@tailwindcss/vite": "^4.1.16",
+    "@pinia/nuxt": "^0.11.3",
+    "@supabase/supabase-js": "^2.80.0",
+    "@tailwindcss/vite": "^4.1.17",
     "@tauri-apps/api": "^2.9.0",
     "@tauri-apps/plugin-dialog": "^2.4.2",
     "@tauri-apps/plugin-fs": "^2.4.4",
@@ -38,32 +38,32 @@
     "@vueuse/gesture": "^2.0.0",
     "@vueuse/nuxt": "^13.9.0",
     "drizzle-orm": "^0.44.7",
-    "eslint": "^9.38.0",
+    "eslint": "^9.39.1",
     "nuxt-zod-i18n": "^1.12.1",
     "swiper": "^12.0.3",
-    "tailwindcss": "^4.1.16",
-    "vue": "^3.5.22",
+    "tailwindcss": "^4.1.17",
+    "vue": "^3.5.24",
     "vue-router": "^4.6.3",
     "zod": "^3.25.76"
   },
   "devDependencies": {
     "@iconify-json/hugeicons": "^1.2.17",
-    "@iconify-json/lucide": "^1.2.71",
-    "@iconify/json": "^2.2.401",
-    "@iconify/tailwind4": "^1.0.6",
+    "@iconify-json/lucide": "^1.2.72",
+    "@iconify/json": "^2.2.404",
+    "@iconify/tailwind4": "^1.1.0",
     "@libsql/client": "^0.15.15",
-    "@tauri-apps/cli": "^2.9.1",
-    "@types/node": "^24.9.1",
+    "@tauri-apps/cli": "^2.9.3",
+    "@types/node": "^24.10.0",
     "@vitejs/plugin-vue": "6.0.1",
-    "@vue/compiler-sfc": "^3.5.22",
-    "drizzle-kit": "^0.31.5",
-    "globals": "^16.4.0",
-    "nuxt": "^4.2.0",
+    "@vue/compiler-sfc": "^3.5.24",
+    "drizzle-kit": "^0.31.6",
+    "globals": "^16.5.0",
+    "nuxt": "^4.2.1",
     "prettier": "3.6.2",
     "tsx": "^4.20.6",
     "tw-animate-css": "^1.4.0",
     "typescript": "^5.9.3",
-    "vite": "^7.1.3",
+    "vite": "^7.2.2",
     "vue-tsc": "3.0.6"
   },
   "prettier": {

src-tauri/bindings/ExtensionErrorCode.ts

@@ -0,0 +1,6 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+/**
+ * Error codes for frontend handling
+ */
+export type ExtensionErrorCode = "SecurityViolation" | "NotFound" | "PermissionDenied" | "MutexPoisoned" | "Database" | "Filesystem" | "FilesystemWithPath" | "Http" | "Shell" | "Manifest" | "Validation" | "InvalidPublicKey" | "InvalidSignature" | "InvalidActionString" | "SignatureVerificationFailed" | "CalculateHash" | "Installation";

src-tauri/bindings/SerializedExtensionError.ts

@@ -0,0 +1,6 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+/**
+ * Serialized representation of ExtensionError for TypeScript
+ */
+export type SerializedExtensionError = { code: number, type: string, message: string, extension_id: string | null, };

src-tauri/capabilities/default.json

@@ -30,10 +30,15 @@
     "fs:allow-resource-write-recursive",
     "fs:allow-download-read-recursive",
     "fs:allow-download-write-recursive",
+    "fs:allow-temp-read-recursive",
+    "fs:allow-temp-write-recursive",
     "fs:default",
     {
       "identifier": "fs:scope",
-      "allow": [{ "path": "**" }]
+      "allow": [
+        { "path": "**" },
+        { "path": "$TEMP/**" }
+      ]
     },
     "http:allow-fetch-send",
     "http:allow-fetch",
@@ -44,6 +49,12 @@
     "notification:allow-is-permission-granted",
     "notification:default",
     "opener:allow-open-url",
+    {
+      "identifier": "opener:allow-open-path",
+      "allow": [
+        { "path": "$TEMP/**" }
+      ]
+    },
     "opener:default",
     "os:allow-hostname",
     "os:default",

src-tauri/gen/schemas/capabilities.json

@@ -1 +1 @@
-{"default":{"identifier":"default","description":"Capability for the main window","local":true,"windows":["main"],"permissions":["core:default","core:webview:allow-create-webview-window","core:webview:allow-create-webview","core:webview:allow-webview-show","core:webview:default","core:window:allow-create","core:window:allow-get-all-windows","core:window:allow-show","core:window:default","dialog:default","fs:allow-appconfig-read-recursive","fs:allow-appconfig-write-recursive","fs:allow-appdata-read-recursive","fs:allow-appdata-write-recursive","fs:allow-applocaldata-read-recursive","fs:allow-applocaldata-write-recursive","fs:allow-read-file","fs:allow-write-file","fs:allow-read-dir","fs:allow-mkdir","fs:allow-exists","fs:allow-remove","fs:allow-resource-read-recursive","fs:allow-resource-write-recursive","fs:allow-download-read-recursive","fs:allow-download-write-recursive","fs:default",{"identifier":"fs:scope","allow":[{"path":"**"}]},"http:allow-fetch-send","http:allow-fetch","http:default","notification:allow-create-channel","notification:allow-list-channels","notification:allow-notify","notification:allow-is-permission-granted","notification:default","opener:allow-open-url","opener:default","os:allow-hostname","os:default","store:default"]}}
+{"default":{"identifier":"default","description":"Capability for the main window","local":true,"windows":["main"],"permissions":["core:default","core:webview:allow-create-webview-window","core:webview:allow-create-webview","core:webview:allow-webview-show","core:webview:default","core:window:allow-create","core:window:allow-get-all-windows","core:window:allow-show","core:window:default","dialog:default","fs:allow-appconfig-read-recursive","fs:allow-appconfig-write-recursive","fs:allow-appdata-read-recursive","fs:allow-appdata-write-recursive","fs:allow-applocaldata-read-recursive","fs:allow-applocaldata-write-recursive","fs:allow-read-file","fs:allow-write-file","fs:allow-read-dir","fs:allow-mkdir","fs:allow-exists","fs:allow-remove","fs:allow-resource-read-recursive","fs:allow-resource-write-recursive","fs:allow-download-read-recursive","fs:allow-download-write-recursive","fs:allow-temp-read-recursive","fs:allow-temp-write-recursive","fs:default",{"identifier":"fs:scope","allow":[{"path":"**"},{"path":"$TEMP/**"}]},"http:allow-fetch-send","http:allow-fetch","http:default","notification:allow-create-channel","notification:allow-list-channels","notification:allow-notify","notification:allow-is-permission-granted","notification:default","opener:allow-open-url",{"identifier":"opener:allow-open-path","allow":[{"path":"$TEMP/**"}]},"opener:default","os:allow-hostname","os:default","store:default"]}}

src-tauri/src/extension/error.rs

@@ -1,10 +1,12 @@
 // src-tauri/src/extension/error.rs
 use thiserror::Error;
+use ts_rs::TS;
 
 use crate::database::error::DatabaseError;
 
 /// Error codes for frontend handling
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, TS)]
+#[ts(export)]
 pub enum ExtensionErrorCode {
     SecurityViolation = 1000,
     NotFound = 1001,
@@ -25,6 +27,17 @@ pub enum ExtensionErrorCode {
     Installation = 5000,
 }
 
+/// Serialized representation of ExtensionError for TypeScript
+#[derive(Debug, Clone, serde::Serialize, TS)]
+#[ts(export)]
+pub struct SerializedExtensionError {
+    pub code: u16,
+    #[serde(rename = "type")]
+    pub error_type: String,
+    pub message: String,
+    pub extension_id: Option<String>,
+}
+
 impl serde::Serialize for ExtensionErrorCode {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "haex-hub",
-  "version": "0.1.4",
+  "version": "0.1.13",
   "identifier": "space.haex.hub",
   "build": {
     "beforeDevCommand": "pnpm dev",

src/components/haex/extension/launcher.vue

@@ -1,5 +1,5 @@
 <template>
-  <UDrawer
+  <UiDrawer
     v-model:open="open"
     direction="right"
     :title="t('launcher.title')"
@@ -7,9 +7,6 @@
     :overlay="false"
     :modal="false"
     :handle-only="true"
-    :ui="{
-      content: 'w-dvw max-w-md sm:max-w-fit',
-    }"
   >
     <UButton
       icon="material-symbols:apps"
@@ -66,7 +63,7 @@
         </div>
       </div>
     </template>
-  </UDrawer>
+  </UiDrawer>
 
   <!-- Uninstall Confirmation Dialog -->
   <UiDialogConfirm

src/components/haex/system/developer.vue

@@ -163,8 +163,9 @@ const loadDevExtensionAsync = async () => {
     extensionPath.value = ''
   } catch (error) {
     console.error('Failed to load dev extension:', error)
+    const { getErrorMessage } = useExtensionError()
     add({
-      description: t('add.errors.loadFailed') + error,
+      description: `${t('add.errors.loadFailed')}: ${getErrorMessage(error)}`,
       color: 'error',
     })
   } finally {
@@ -196,8 +197,9 @@ const reloadDevExtensionAsync = async (extension: ExtensionInfoResponse) => {
     })
   } catch (error) {
     console.error('Failed to reload dev extension:', error)
+    const { getErrorMessage } = useExtensionError()
     add({
-      description: t('list.errors.reloadFailed') + error,
+      description: `${t('list.errors.reloadFailed')}: ${getErrorMessage(error)}`,
       color: 'error',
     })
   }
@@ -223,8 +225,9 @@ const removeDevExtensionAsync = async (extension: ExtensionInfoResponse) => {
     await loadExtensionsAsync()
   } catch (error) {
     console.error('Failed to remove dev extension:', error)
+    const { getErrorMessage } = useExtensionError()
     add({
-      description: t('list.errors.removeFailed') + error,
+      description: `${t('list.errors.removeFailed')}: ${getErrorMessage(error)}`,
       color: 'error',
     })
   }

src/components/haex/window/index.vue

@@ -83,6 +83,7 @@
 </template>
 
 <script setup lang="ts">
+import { getAvailableContentHeight } from '~/utils/viewport'
 const props = defineProps<{
   id: string
   title: string
@@ -329,31 +330,11 @@ const handleMaximize = () => {
     const bounds = getViewportBounds()
 
     if (bounds && bounds.width > 0 && bounds.height > 0) {
-      // Get safe-area-insets from CSS variables for debug
-      const safeAreaTop = parseFloat(
-        getComputedStyle(document.documentElement).getPropertyValue(
-          '--safe-area-inset-top',
-        ) || '0',
-      )
-      const safeAreaBottom = parseFloat(
-        getComputedStyle(document.documentElement).getPropertyValue(
-          '--safe-area-inset-bottom',
-        ) || '0',
-      )
-
-      // Desktop container uses 'absolute inset-0' which stretches over full viewport
-      // bounds.height = full viewport height (includes header area + safe-areas)
-      // We need to calculate available space properly
-
-      // Get header height from UI store (measured reactively in layout)
-      const uiStore = useUiStore()
-      const headerHeight = uiStore.headerHeight
-
       x.value = 0
-      y.value = 0 // Start below header and status bar
+      y.value = 0
       width.value = bounds.width
-      // Height: viewport - header - both safe-areas
-      height.value = bounds.height - headerHeight - safeAreaTop - safeAreaBottom
+      // Use helper function to calculate correct height with safe areas
+      height.value = getAvailableContentHeight()
       isMaximized.value = true
     }
   }

src/components/haex/window/overview.vue

@@ -1,5 +1,5 @@
 <template>
-  <UDrawer
+  <UiDrawer
     v-model:open="localShowWindowOverview"
     direction="bottom"
     :title="t('modal.title')"
@@ -70,7 +70,7 @@
         </div>
       </div>
     </template>
-  </UDrawer>
+  </UiDrawer>
 </template>
 
 <script setup lang="ts">

src/components/haex/workspace/drawer.vue

@@ -1,5 +1,5 @@
 <template>
-  <UDrawer
+  <UiDrawer
     v-model:open="isOverviewMode"
     direction="left"
     :overlay="false"
@@ -8,7 +8,7 @@
     description="Workspaces"
   >
     <template #content>
-      <div class="py-8 pl-8 pr-4 h-full overflow-y-auto">
+      <div class="pl-8 pr-4 overflow-y-auto py-8">
         <!-- Workspace Cards -->
         <div class="flex flex-col gap-3">
           <HaexWorkspaceCard
@@ -29,7 +29,7 @@
         />
       </div>
     </template>
-  </UDrawer>
+  </UiDrawer>
 </template>
 
 <script setup lang="ts">

src/components/ui/Drawer.vue

@@ -0,0 +1,32 @@
+<template>
+  <UDrawer
+    v-bind="$attrs"
+    :ui="{
+      content:
+        'pb-[env(safe-area-inset-bottom)] pt-[env(safe-area-inset-top)] ',
+      ...(ui || {}),
+    }"
+  >
+    <template
+      v-for="(_, name) in $slots"
+      #[name]="slotData"
+    >
+      <slot
+        :name="name"
+        v-bind="slotData"
+      />
+    </template>
+  </UDrawer>
+</template>
+
+<script setup lang="ts">
+import type { DrawerProps } from '@nuxt/ui'
+
+/**
+ * Wrapper around UDrawer that automatically applies safe area insets for mobile devices.
+ * Passes through all props and slots to UDrawer.
+ */
+const props = defineProps</* @vue-ignore */ DrawerProps>()
+
+const { ui } = toRefs(props)
+</script>

src/components/ui/input/index.vue

@@ -83,8 +83,6 @@ const filteredSlots = computed(() => {
     Object.entries(useSlots()).filter(([name]) => name !== 'trailing'),
   )
 })
-
-const { isSmallScreen } = storeToRefs(useUiStore())
 </script>
 
 <i18n lang="yaml">

src/composables/extensionMessageHandler.ts

@@ -1,38 +1,29 @@
 // composables/extensionMessageHandler.ts
-import { invoke } from '@tauri-apps/api/core'
 import type { IHaexHubExtension } from '~/types/haexhub'
 import {
   EXTENSION_PROTOCOL_NAME,
   EXTENSION_PROTOCOL_PREFIX,
 } from '~/config/constants'
-import type { Platform } from '@tauri-apps/plugin-os'
-
-interface ExtensionRequest {
-  id: string
-  method: string
-  params: Record<string, unknown>
-  timestamp: number
-}
+import {
+  handleDatabaseMethodAsync,
+  handleFilesystemMethodAsync,
+  handleHttpMethodAsync,
+  handlePermissionsMethodAsync,
+  handleContextMethodAsync,
+  handleStorageMethodAsync,
+  setContextGetters,
+  type ExtensionRequest,
+  type ExtensionInstance,
+} from './handlers'
 
 // Globaler Handler - nur einmal registriert
 let globalHandlerRegistered = false
-interface ExtensionInstance {
-  extension: IHaexHubExtension
-  windowId: string
-}
 const iframeRegistry = new Map<HTMLIFrameElement, ExtensionInstance>()
 // Map event.source (WindowProxy) to extension instance for sandbox-compatible matching
 const sourceRegistry = new Map<Window, ExtensionInstance>()
 // Reverse map: window ID to Window for broadcasting (supports multiple windows per extension)
 const windowIdToWindowMap = new Map<string, Window>()
 
-// Store context values that need to be accessed outside setup
-let contextGetters: {
-  getTheme: () => string
-  getLocale: () => string
-  getPlatform: () => Platform | undefined
-} | null = null
-
 const registerGlobalMessageHandler = () => {
   if (globalHandlerRegistered) return
 
@@ -227,13 +218,11 @@ export const useExtensionMessageHandler = (
   const { locale } = useI18n()
   const { platform } = useDeviceStore()
   // Store getters for use outside setup context
-  if (!contextGetters) {
-    contextGetters = {
+  setContextGetters({
     getTheme: () => currentTheme.value?.value || 'system',
     getLocale: () => locale.value,
     getPlatform: () => platform,
-    }
-  }
+  })
 
   // Registriere globalen Handler beim ersten Aufruf
   registerGlobalMessageHandler()
@@ -275,12 +264,7 @@ export const registerExtensionIFrame = (
   // Stelle sicher, dass der globale Handler registriert ist
   registerGlobalMessageHandler()
 
-  // Warnung wenn Context Getters nicht initialisiert wurden
-  if (!contextGetters) {
-    console.warn(
-      'Context getters not initialized. Make sure useExtensionMessageHandler was called in setup context first.',
-    )
-  }
+  // Note: Context getters should be initialized via useExtensionMessageHandler first
 
   iframeRegistry.set(iframe, { extension, windowId })
 }
@@ -338,221 +322,21 @@ export const broadcastContextToAllExtensions = (context: {
     timestamp: Date.now(),
   }
 
-  console.log('[ExtensionHandler] Broadcasting context to all extensions:', context)
+  console.log(
+    '[ExtensionHandler] Broadcasting context to all extensions:',
+    context,
+  )
 
   // Send to all registered extension windows
   for (const [_, instance] of iframeRegistry.entries()) {
     const win = windowIdToWindowMap.get(instance.windowId)
     if (win) {
-      console.log('[ExtensionHandler] Sending context to:', instance.extension.name, instance.windowId)
+      console.log(
+        '[ExtensionHandler] Sending context to:',
+        instance.extension.name,
+        instance.windowId,
+      )
       win.postMessage(message, '*')
     }
   }
 }
-
-// ==========================================
-// Database Methods
-// ==========================================
-
-async function handleDatabaseMethodAsync(
-  request: ExtensionRequest,
-  extension: IHaexHubExtension, // Direkter Typ
-) {
-  const params = request.params as {
-    query?: string
-    params?: unknown[]
-  }
-
-  switch (request.method) {
-    case 'haextension.db.query': {
-      try {
-        const rows = await invoke<unknown[]>('extension_sql_select', {
-          sql: params.query || '',
-          params: params.params || [],
-          publicKey: extension.publicKey,
-          name: extension.name,
-        })
-
-        return {
-          rows,
-          rowsAffected: 0,
-          lastInsertId: undefined,
-        }
-      } catch (error: any) {
-        // If error is about non-SELECT statements (INSERT/UPDATE/DELETE with RETURNING),
-        // automatically retry with execute
-        if (error?.message?.includes('Only SELECT statements are allowed')) {
-          const rows = await invoke<unknown[]>('extension_sql_execute', {
-            sql: params.query || '',
-            params: params.params || [],
-            publicKey: extension.publicKey,
-            name: extension.name,
-          })
-
-          return {
-            rows,
-            rowsAffected: rows.length,
-            lastInsertId: undefined,
-          }
-        }
-        throw error
-      }
-    }
-
-    case 'haextension.db.execute': {
-      const rows = await invoke<unknown[]>('extension_sql_execute', {
-        sql: params.query || '',
-        params: params.params || [],
-        publicKey: extension.publicKey,
-        name: extension.name,
-      })
-
-      return {
-        rows,
-        rowsAffected: 1,
-        lastInsertId: undefined,
-      }
-    }
-
-    case 'haextension.db.transaction': {
-      const statements =
-        (request.params as { statements?: string[] }).statements || []
-
-      for (const stmt of statements) {
-        await invoke('extension_sql_execute', {
-          sql: stmt,
-          params: [],
-          publicKey: extension.publicKey,
-          name: extension.name,
-        })
-      }
-
-      return { success: true }
-    }
-
-    default:
-      throw new Error(`Unknown database method: ${request.method}`)
-  }
-}
-// ==========================================
-// Filesystem Methods (TODO)
-// ==========================================
-
-async function handleFilesystemMethodAsync(
-  request: ExtensionRequest,
-  extension: IHaexHubExtension,
-) {
-  if (!request || !extension) return
-  // TODO: Implementiere Filesystem Commands im Backend
-  throw new Error('Filesystem methods not yet implemented')
-}
-
-// ==========================================
-// HTTP Methods (TODO)
-// ==========================================
-
-async function handleHttpMethodAsync(
-  request: ExtensionRequest,
-  extension: IHaexHubExtension,
-) {
-  if (!extension || !request) {
-    throw new Error('Extension not found')
-  }
-
-  // TODO: Implementiere HTTP Commands im Backend
-  throw new Error('HTTP methods not yet implemented')
-}
-
-// ==========================================
-// Permission Methods (TODO)
-// ==========================================
-
-async function handlePermissionsMethodAsync(
-  request: ExtensionRequest,
-  extension: IHaexHubExtension,
-) {
-  if (!extension || !request) {
-    throw new Error('Extension not found')
-  }
-
-  // TODO: Implementiere Permission Request UI
-  throw new Error('Permission methods not yet implemented')
-}
-
-// ==========================================
-// Context Methods
-// ==========================================
-
-async function handleContextMethodAsync(request: ExtensionRequest) {
-  switch (request.method) {
-    case 'haextension.context.get':
-      if (!contextGetters) {
-        throw new Error(
-          'Context not initialized. Make sure useExtensionMessageHandler is called in a component.',
-        )
-      }
-      return {
-        theme: contextGetters.getTheme(),
-        locale: contextGetters.getLocale(),
-        platform: contextGetters.getPlatform(),
-      }
-
-    default:
-      throw new Error(`Unknown context method: ${request.method}`)
-  }
-}
-
-// ==========================================
-// Storage Methods
-// ==========================================
-
-async function handleStorageMethodAsync(
-  request: ExtensionRequest,
-  instance: ExtensionInstance,
-) {
-  // Storage is now per-window, not per-extension
-  const storageKey = `ext_${instance.extension.id}_${instance.windowId}_`
-  console.log(
-    `[HaexHub Storage] ${request.method} for window ${instance.windowId}`,
-  )
-
-  switch (request.method) {
-    case 'haextension.storage.getItem': {
-      const key = request.params.key as string
-      return localStorage.getItem(storageKey + key)
-    }
-
-    case 'haextension.storage.setItem': {
-      const key = request.params.key as string
-      const value = request.params.value as string
-      localStorage.setItem(storageKey + key, value)
-      return null
-    }
-
-    case 'haextension.storage.removeItem': {
-      const key = request.params.key as string
-      localStorage.removeItem(storageKey + key)
-      return null
-    }
-
-    case 'haextension.storage.clear': {
-      // Remove only instance-specific keys
-      const keys = Object.keys(localStorage).filter((k) =>
-        k.startsWith(storageKey),
-      )
-      keys.forEach((k) => localStorage.removeItem(k))
-      return null
-    }
-
-    case 'haextension.storage.keys': {
-      // Return only instance-specific keys (without prefix)
-      const keys = Object.keys(localStorage)
-        .filter((k) => k.startsWith(storageKey))
-        .map((k) => k.substring(storageKey.length))
-      return keys
-    }
-
-    default:
-      throw new Error(`Unknown storage method: ${request.method}`)
-  }
-}

src/composables/handlers/context.ts

@@ -0,0 +1,36 @@
+import type { Platform } from '@tauri-apps/plugin-os'
+import type { ExtensionRequest } from './types'
+
+// Context getters are set from the main handler during initialization
+let contextGetters: {
+  getTheme: () => string
+  getLocale: () => string
+  getPlatform: () => Platform | undefined
+} | null = null
+
+export function setContextGetters(getters: {
+  getTheme: () => string
+  getLocale: () => string
+  getPlatform: () => Platform | undefined
+}) {
+  contextGetters = getters
+}
+
+export async function handleContextMethodAsync(request: ExtensionRequest) {
+  switch (request.method) {
+    case 'haextension.context.get':
+      if (!contextGetters) {
+        throw new Error(
+          'Context not initialized. Make sure useExtensionMessageHandler is called in a component.',
+        )
+      }
+      return {
+        theme: contextGetters.getTheme(),
+        locale: contextGetters.getLocale(),
+        platform: contextGetters.getPlatform(),
+      }
+
+    default:
+      throw new Error(`Unknown context method: ${request.method}`)
+  }
+}

src/composables/handlers/database.ts

@@ -0,0 +1,84 @@
+import { invoke } from '@tauri-apps/api/core'
+import type { IHaexHubExtension } from '~/types/haexhub'
+import type { ExtensionRequest } from './types'
+
+export async function handleDatabaseMethodAsync(
+  request: ExtensionRequest,
+  extension: IHaexHubExtension,
+) {
+  const params = request.params as {
+    query?: string
+    params?: unknown[]
+  }
+
+  switch (request.method) {
+    case 'haextension.db.query': {
+      try {
+        const rows = await invoke<unknown[]>('extension_sql_select', {
+          sql: params.query || '',
+          params: params.params || [],
+          publicKey: extension.publicKey,
+          name: extension.name,
+        })
+
+        return {
+          rows,
+          rowsAffected: 0,
+          lastInsertId: undefined,
+        }
+      } catch (error) {
+        // If error is about non-SELECT statements (INSERT/UPDATE/DELETE with RETURNING),
+        // automatically retry with execute
+        if (error?.message?.includes('Only SELECT statements are allowed')) {
+          const rows = await invoke<unknown[]>('extension_sql_execute', {
+            sql: params.query || '',
+            params: params.params || [],
+            publicKey: extension.publicKey,
+            name: extension.name,
+          })
+
+          return {
+            rows,
+            rowsAffected: rows.length,
+            lastInsertId: undefined,
+          }
+        }
+        throw error
+      }
+    }
+
+    case 'haextension.db.execute': {
+      const rows = await invoke<unknown[]>('extension_sql_execute', {
+        sql: params.query || '',
+        params: params.params || [],
+        publicKey: extension.publicKey,
+        name: extension.name,
+      })
+
+      return {
+        rows,
+        rowsAffected: 1,
+        lastInsertId: undefined,
+      }
+    }
+
+    case 'haextension.db.transaction': {
+      const statements =
+        (request.params as { statements?: string[] }).statements || []
+
+      for (const stmt of statements) {
+        await invoke('extension_sql_execute', {
+          sql: stmt,
+          params: [],
+          publicKey: extension.publicKey,
+          name: extension.name,
+        })
+      }
+
+      return { success: true }
+    }
+
+    default:
+      throw new Error(`Unknown database method: ${request.method}`)
+  }
+}

src/composables/handlers/filesystem.ts

@@ -0,0 +1,92 @@
+import { save } from '@tauri-apps/plugin-dialog'
+import { writeFile } from '@tauri-apps/plugin-fs'
+import { openPath } from '@tauri-apps/plugin-opener'
+import { tempDir, join } from '@tauri-apps/api/path'
+import type { IHaexHubExtension } from '~/types/haexhub'
+import type { ExtensionRequest } from './types'
+
+export async function handleFilesystemMethodAsync(
+  request: ExtensionRequest,
+  extension: IHaexHubExtension,
+) {
+  if (!request || !extension) return
+
+  switch (request.method) {
+    case 'haextension.fs.saveFile': {
+      const params = request.params as {
+        data: number[]
+        defaultPath?: string
+        title?: string
+        filters?: Array<{ name: string; extensions: string[] }>
+      }
+
+      // Convert number array back to Uint8Array
+      const data = new Uint8Array(params.data)
+
+      // Open save dialog
+      const filePath = await save({
+        defaultPath: params.defaultPath,
+        title: params.title || 'Save File',
+        filters: params.filters,
+      })
+
+      // User cancelled
+      if (!filePath) {
+        return null
+      }
+
+      // Write file
+      await writeFile(filePath, data)
+
+      return {
+        path: filePath,
+        success: true,
+      }
+    }
+
+    case 'haextension.fs.showImage': {
+      // This method is now handled by the frontend using PhotoSwipe
+      // We keep it for backwards compatibility but it's a no-op
+      return {
+        success: true,
+        useFrontend: true,
+      }
+    }
+
+    case 'haextension.fs.openFile': {
+      const params = request.params as {
+        data: number[]
+        fileName: string
+        mimeType?: string
+      }
+
+      try {
+        // Convert number array back to Uint8Array
+        const data = new Uint8Array(params.data)
+
+        // Get temp directory and create file path
+        const tempDirPath = await tempDir()
+        const tempFilePath = await join(tempDirPath, params.fileName)
+
+        // Write file to temp directory
+        await writeFile(tempFilePath, data)
+
+        // Open file with system's default viewer
+        await openPath(tempFilePath)
+
+        return {
+          success: true,
+        }
+      }
+      catch (error) {
+        console.error('[Filesystem] Error opening file:', error)
+        return {
+          success: false,
+        }
+      }
+    }
+
+    default:
+      throw new Error(`Unknown filesystem method: ${request.method}`)
+  }
+}

src/composables/handlers/http.ts

@@ -0,0 +1,14 @@
+import type { IHaexHubExtension } from '~/types/haexhub'
+import type { ExtensionRequest } from './types'
+
+export async function handleHttpMethodAsync(
+  request: ExtensionRequest,
+  extension: IHaexHubExtension,
+) {
+  if (!extension || !request) {
+    throw new Error('Extension not found')
+  }
+
+  // TODO: Implementiere HTTP Commands im Backend
+  throw new Error('HTTP methods not yet implemented')
+}

src/composables/handlers/index.ts

@@ -0,0 +1,10 @@
+// Export all handler functions
+export { handleDatabaseMethodAsync } from './database'
+export { handleFilesystemMethodAsync } from './filesystem'
+export { handleHttpMethodAsync } from './http'
+export { handlePermissionsMethodAsync } from './permissions'
+export { handleContextMethodAsync, setContextGetters } from './context'
+export { handleStorageMethodAsync } from './storage'
+
+// Export shared types
+export type { ExtensionRequest, ExtensionInstance } from './types'

src/composables/handlers/permissions.ts

@@ -0,0 +1,14 @@
+import type { IHaexHubExtension } from '~/types/haexhub'
+import type { ExtensionRequest } from './types'
+
+export async function handlePermissionsMethodAsync(
+  request: ExtensionRequest,
+  extension: IHaexHubExtension,
+) {
+  if (!extension || !request) {
+    throw new Error('Extension not found')
+  }
+
+  // TODO: Implementiere Permission Request UI
+  throw new Error('Permission methods not yet implemented')
+}

src/composables/handlers/storage.ts

@@ -0,0 +1,52 @@
+import type { ExtensionRequest, ExtensionInstance } from './types'
+
+export async function handleStorageMethodAsync(
+  request: ExtensionRequest,
+  instance: ExtensionInstance,
+) {
+  // Storage is now per-window, not per-extension
+  const storageKey = `ext_${instance.extension.id}_${instance.windowId}_`
+  console.log(
+    `[HaexHub Storage] ${request.method} for window ${instance.windowId}`,
+  )
+
+  switch (request.method) {
+    case 'haextension.storage.getItem': {
+      const key = request.params.key as string
+      return localStorage.getItem(storageKey + key)
+    }
+
+    case 'haextension.storage.setItem': {
+      const key = request.params.key as string
+      const value = request.params.value as string
+      localStorage.setItem(storageKey + key, value)
+      return null
+    }
+
+    case 'haextension.storage.removeItem': {
+      const key = request.params.key as string
+      localStorage.removeItem(storageKey + key)
+      return null
+    }
+
+    case 'haextension.storage.clear': {
+      // Remove only instance-specific keys
+      const keys = Object.keys(localStorage).filter((k) =>
+        k.startsWith(storageKey),
+      )
+      keys.forEach((k) => localStorage.removeItem(k))
+      return null
+    }
+
+    case 'haextension.storage.keys': {
+      // Return only instance-specific keys (without prefix)
+      const keys = Object.keys(localStorage)
+        .filter((k) => k.startsWith(storageKey))
+        .map((k) => k.substring(storageKey.length))
+      return keys
+    }
+
+    default:
+      throw new Error(`Unknown storage method: ${request.method}`)
+  }
+}

src/composables/handlers/types.ts

@@ -0,0 +1,14 @@
+// Shared types for extension message handlers
+import type { IHaexHubExtension } from '~/types/haexhub'
+
+export interface ExtensionRequest {
+  id: string
+  method: string
+  params: Record<string, unknown>
+  timestamp: number
+}
+
+export interface ExtensionInstance {
+  extension: IHaexHubExtension
+  windowId: string
+}

src/composables/useExtensionError.ts

@@ -0,0 +1,43 @@
+import type { SerializedExtensionError } from '~~/src-tauri/bindings/SerializedExtensionError'
+
+/**
+ * Type guard to check if error is a SerializedExtensionError
+ */
+export function isSerializedExtensionError(error: unknown): error is SerializedExtensionError {
+  return (
+    typeof error === 'object' &&
+    error !== null &&
+    'code' in error &&
+    'message' in error &&
+    'type' in error
+  )
+}
+
+/**
+ * Extract error message from unknown error type
+ */
+export function getErrorMessage(error: unknown): string {
+  if (isSerializedExtensionError(error)) {
+    return error.message
+  }
+
+  if (error instanceof Error) {
+    return error.message
+  }
+
+  if (typeof error === 'string') {
+    return error
+  }
+
+  return String(error)
+}
+
+/**
+ * Composable for handling extension errors
+ */
+export function useExtensionError() {
+  return {
+    isSerializedExtensionError,
+    getErrorMessage,
+  }
+}

src/stores/desktop/windowManager.ts

@@ -1,4 +1,5 @@
 import { defineAsyncComponent, type Component } from 'vue'
+import { getFullscreenDimensions } from '~/utils/viewport'
 
 export interface IWindow {
   id: string
@@ -191,11 +192,30 @@ export const useWindowManagerStore = defineStore('windowManager', () => {
       const viewportHeight = window.innerHeight - 60
 
       console.log('viewportHeight', window.innerHeight, viewportHeight)
-      const windowHeight = Math.min(height, viewportHeight)
+
+      // Check if we're on a small screen
+      const { isSmallScreen } = useUiStore()
+
+      let windowWidth: number
+      let windowHeight: number
+      let x: number
+      let y: number
+
+      if (isSmallScreen) {
+        // On small screens, make window fullscreen starting at 0,0
+        // Use helper function to calculate correct dimensions with safe areas
+        const fullscreen = getFullscreenDimensions()
+        x = fullscreen.x
+        y = fullscreen.y
+        windowWidth = fullscreen.width
+        windowHeight = fullscreen.height
+      } else {
+        // On larger screens, use normal sizing and positioning
+        windowHeight = Math.min(height, viewportHeight)
 
         // Adjust width proportionally if needed (optional)
         const aspectRatio = width / height
-      const windowWidth = Math.min(
+        windowWidth = Math.min(
           width,
           viewportWidth,
           windowHeight * aspectRatio,
@@ -205,8 +225,9 @@ export const useWindowManagerStore = defineStore('windowManager', () => {
         const offset = currentWorkspaceWindows.value.length * 30
         const centerX = Math.max(0, (viewportWidth - windowWidth) / 1 / 3)
         const centerY = Math.max(0, (viewportHeight - windowHeight) / 1 / 3)
-      const x = Math.min(centerX + offset, viewportWidth - windowWidth)
-      const y = Math.min(centerY + offset, viewportHeight - windowHeight)
+        x = Math.min(centerX + offset, viewportWidth - windowWidth)
+        y = Math.min(centerY + offset, viewportHeight - windowHeight)
+      }
 
       const newWindow: IWindow = {
         id: windowId,

src/utils/viewport.ts

@@ -0,0 +1,63 @@
+// Viewport and safe area utilities
+
+export interface ViewportDimensions {
+  width: number
+  height: number
+  safeAreaTop: number
+  safeAreaBottom: number
+  headerHeight: number
+}
+
+/**
+ * Get viewport dimensions with safe areas and header height
+ */
+export function getViewportDimensions(): ViewportDimensions {
+  const viewportWidth = window.innerWidth
+  const viewportHeight = window.innerHeight - 40 // Subtract header height
+
+  // Get safe-area-insets from CSS variables
+  const safeAreaTop = parseFloat(
+    getComputedStyle(document.documentElement).getPropertyValue(
+      '--safe-area-inset-top',
+    ) || '0',
+  )
+  const safeAreaBottom = parseFloat(
+    getComputedStyle(document.documentElement).getPropertyValue(
+      '--safe-area-inset-bottom',
+    ) || '0',
+  )
+
+  // Get header height from UI store
+  const { headerHeight } = useUiStore()
+
+  return {
+    width: viewportWidth,
+    height: viewportHeight,
+    safeAreaTop,
+    safeAreaBottom,
+    headerHeight,
+  }
+}
+
+/**
+ * Calculate available content height (viewport height minus safe areas)
+ * Note: viewport height already excludes header, so we only subtract safe areas
+ */
+export function getAvailableContentHeight(): number {
+  const dimensions = getViewportDimensions()
+  return dimensions.height - dimensions.safeAreaTop - dimensions.safeAreaBottom
+}
+
+/**
+ * Calculate fullscreen window dimensions (for small screens)
+ */
+export function getFullscreenDimensions() {
+  const dimensions = getViewportDimensions()
+
+  return {
+    x: 0,
+    y: 0,
+    width: dimensions.width,
+    height: getAvailableContentHeight(),
+  }
+}