Add context menu for vault actions and trash functionality

- Add UiButtonContext component for context menu support on buttons
- Implement vault trash functionality using trash crate
- Move vaults to system trash on desktop (with fallback to permanent delete on mobile)
- Add context menu to vault list items for better mobile UX
- Keep hover delete button for desktop users

src/stores/vault/lastVaults.ts

@@ -22,9 +22,14 @@ export const useLastVaultStore = defineStore('lastVaultStore', () => {
     return await invoke('delete_vault', { vaultName })
   }
 
+  const moveVaultToTrashAsync = async (vaultName: string) => {
+    return await invoke('move_vault_to_trash', { vaultName })
+  }
+
   return {
     syncLastVaultsAsync,
     lastVaults,
     removeVaultAsync,
+    moveVaultToTrashAsync,
   }
 })