Fix autocomplete app list integration: missing deps, Android 11+ visibility, safety & UX issues

[Copilot]

The original autocomplete implementation had several issues preventing it from compiling or working correctly: missing pubspec.yaml dependencies, no Android 11+ package visibility declaration, unsafe icon access, startup jank from eager app loading, and the URL field being set to an app name instead of a valid store URL.

Dependencies

• Added device_apps: ^2.2.0 and flutter_typeahead: ^5.2.0 to pubspec.yaml (were imported but undeclared)

Android 11+ package visibility

• Added <queries> block to AndroidManifest.xml so DeviceApps can enumerate installed packages on API 30+

Correctness & safety

• onSuggestionSelected now sets a valid store URL instead of the app name:

  _titleController.text = Platform.isIOS
      ? suggestion.packageName  // bundle ID (Apple system apps have no App Store URL)
      : 'https://play.google.com/store/apps/details?id=${suggestion.packageName}';

• itemBuilder checks suggestion is ApplicationWithIcon before accessing .icon; falls back to a Unicode-safe initial-letter avatar via runes.first
• Added if (!mounted) return after every await in getInstalledApps()

Performance

• App list loading deferred from initState to first focus of the URL field; guarded by _appsLoaded to prevent redundant fetches
• includeSystemApps: false to cut down enumerated app count
• suggestionsCallback short-circuits for queries < 2 chars and caps results at 20

iOS model

• Added _iosBundleToName lookup so bundle IDs render as human-friendly names ("com.apple.mobilesafari" → "Safari", etc.)

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