[Bug] Inputs dead after import in Electron AppImage until refresh

[CodeWithMa]

Description

After importing data in the Electron AppImage, text inputs stop working app-wide (e.g. Add Item title box can't be focused/typed into). Refreshing fixes it. Does not happen on web (Firefox / GitHub Pages).

Suspected since at least b839074, still present on latest.

Repro

1. Open Electron AppImage
2. Settings -> Import Data -> pick export JSON -> confirm Importing will replace all existing data
3. Import succeeds
4. Go to Add New Item -> click Title input -> no caret, typing does nothing

Expected

Inputs keep working after import.

Actual

All text inputs unfocusable/untypable until window reload (or window blur/focus? untested).

Suspected cause (unverified)

Native window.confirm() in src/app/components/settings/settings.component.ts:582 (onFileSelected) triggers known Electron focus-desync bug (electron/electron#40212, #41603): native alert/confirm steals BrowserWindow focus and renderer never gets keyboard focus back. Same confirm/alert pattern exists in src/app/components/group-manager/group-manager.component.ts:162,167.

Amplifier: settings.component.ts:331-345 nests <button (click)="fileInput.click()"> inside <label> with hidden file input -> double file-picker activation before confirm(). poster-picker.component.ts:91-96 does it correctly (label only).

Data layer looks innocent: after refresh the imported data loads fine (StorageService.importDataWithImages, ImageStorageService.parseExportedImages, ProviderSettingsService.importSettings).

electron/main.ts: frame:false, sandbox:true, no focus restore workaround.

To verify

• Does group delete (confirm) cause same symptom? YES
• Does file-picker-cancel (no confirm) vs confirm-cancel vs confirm-ok isolate it to confirm?
• Does alt-tab/minimize-restore fix it without refresh?
• Check document.hasFocus() after repro in electron:dev

Suggested fix

• Replace native confirm/alert with in-app modal (or dialog.showMessageBox via IPC + win.blur(); win.focus() workaround)
• Fix import button: remove <label> wrapper or explicit .click(), use type="button"
• Apply same to group-manager delete