* feat(import): support folder picker on iOS via native-bridge
Tauri's dialog plugin rejects folder picks on both mobile platforms with FolderPickerNotImplemented, so previously only Android could pick an import directory (it already routed through the native-bridge plugin's ACTION_OPEN_DOCUMENT_TREE). iOS users had no working folder-import entry point at all.
Add an iOS implementation of the native-bridge select_directory command using UIDocumentPickerViewController(forOpeningContentTypes: [.folder], asCopy: false), with a dedicated FolderPickerDelegate that:
- holds a strong reference until the picker dismisses (UIKit keeps the delegate weak), and
- calls startAccessingSecurityScopedResource on the picked URL and retains it for the app's lifetime so plain Foundation/POSIX reads against url.path work for the rest of the session.
Route NativeAppService.selectDirectory through the bridge for both iOS and Android, then call allowPathsInScopes so the picked directory is reachable via fs_scope and the asset protocol. The library page's pickImportDirectory entry point now also takes the mobile branch on iOS, while keeping the Android-only MANAGE_EXTERNAL_STORAGE prompt gated behind isAndroidApp.
* feat(ios): persist security-scoped bookmarks for picked folders
iOS hands the folder picker back a security-scoped URL whose access
right is granted only to the running process. The previous
implementation kept the URL alive for the lifetime of the process via a
static `urlsToKeepAlive` array, which worked for the current session
but forced the user to re-pick the same folder after every relaunch.
Add a `FolderBookmarkStore` that:
- Right after the picker returns, calls
`URL.bookmarkData(.minimalBookmark)` and stashes the bytes in
`UserDefaults` keyed by the POSIX path.
- On every `NativeBridgePlugin.load(webview:)`, walks every persisted
bookmark, resolves it back into a URL, and calls
`startAccessingSecurityScopedResource`. Holds the URL alive in a
process-scoped dictionary so subsequent Foundation / POSIX reads
against `url.path` succeed.
- Handles `isStale` by re-encoding the bookmark against the resolved
URL, and drops permanently unresolvable bookmarks (folder gone,
provider uninstalled) from `UserDefaults` so the next launch
doesn't re-attempt them.
Pair this with a Tauri-side change so the same paths are reachable
through both `dir_scanner::read_dir` and the fs plugin's `readDir`:
- `allow_paths_in_scopes` now has an iOS branch that widens
`fs_scope` / `asset_protocol_scope` for any path the frontend hands
it, intentionally without the desktop-side "must already be in
fs_scope" gate. The OS sandbox + bookmark store is the real
access-control boundary on iOS; widening Tauri's in-memory scope
set cannot escalate access beyond what the OS already grants. The
security comment on the command was rewritten to spell this
contract out.
- `allow_file_in_scopes` is now compiled for iOS too (previously
desktop-only) so the file-grant path is available when needed.
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