fix: macOS folder permissions

[PartyDonut]

Pull Request Description

This adds the needed permissions for macOS. Fixing the bug report where Isar/drift was unable to open the database because of read/write errors.

Issue Being Fixed

Resolves #416

[sourcery-ai]

Reviewer's Guide

Wraps sync operations in robust error handling and refactors directory selection logic in the Flutter sync provider, and updates the macOS Runner to support secure state restoration with updated folder access entitlements.

Sequence diagram for improved sync item addition with error handling

sequenceDiagram
    actor User
    participant UI as Flutter UI
    participant SyncNotifier
    participant FilePicker
    participant ClientSettingsProvider
    participant Snackbar
    User->>UI: Initiate addSyncItem
    UI->>SyncNotifier: addSyncItem(context, item)
    alt saveDirectory is null
        SyncNotifier->>FilePicker: getDirectoryPath()
        FilePicker-->>SyncNotifier: selectedDirectory
        alt selectedDirectory is empty
            SyncNotifier->>Snackbar: syncNoFolderSetup
            SyncNotifier-->>UI: return
        else selectedDirectory is valid
            SyncNotifier->>ClientSettingsProvider: setSyncPath(selectedDirectory)
        end
    end
    SyncNotifier->>Snackbar: syncAddItemForSyncing
    SyncNotifier->>SyncNotifier: syncSeries/syncMovie
    SyncNotifier->>Snackbar: startedSyncingItem/unableToSyncItem
    Note over SyncNotifier: If error occurs
    SyncNotifier->>Snackbar: somethingWentWrong
    SyncNotifier-->>UI: return

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File-Level Changes

Change	Details	Files
Enhanced error handling and restructured addSyncItem logic	Encapsulated entire method in try-catch to log errors and show a fallback snackbar Merged saveDirectory assignment into a single conditional block Reorganized snackbar notifications and sync calls to eliminate redundant returns	lib/providers/sync_provider.dart
Enabled secure restorable state in macOS AppDelegate	Added applicationSupportsSecureRestorableState override returning true	macos/Runner/AppDelegate.swift
Updated macOS entitlements for folder read/write access	Added required folder permission keys to both DebugProfile.entitlements and Release.entitlements	macos/Runner/DebugProfile.entitlements macos/Runner/Release.entitlements

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#416	Fix the login process on macOS so that users can successfully log in without the app hanging or failing.	✅
#416	Resolve the underlying file permission/read-write error (as indicated by the Isar/drift database error) that prevents the app from functioning correctly on macOS.	✅

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[sourcery-ai]

Hey @PartyDonut - I've reviewed your changes - here's some feedback:

• It looks like the entitlements files weren’t updated with the com.apple.security.files.user-selected.read-write entitlement, which is required for folder read/write access—please add it to both DebugProfile.entitlements and Release.entitlements.
• The try/catch in addSyncItem now wraps the entire method and may swallow non‐I/O errors; consider narrowing the try block or catching specific exceptions to avoid masking other issues.
• The new applicationSupportsSecureRestorableState override in AppDelegate.swift seems unrelated to folder permissions, so please confirm its necessity or move it to a separate PR.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- It looks like the entitlements files weren’t updated with the com.apple.security.files.user-selected.read-write entitlement, which is required for folder read/write access—please add it to both DebugProfile.entitlements and Release.entitlements.
- The try/catch in addSyncItem now wraps the entire method and may swallow non‐I/O errors; consider narrowing the try block or catching specific exceptions to avoid masking other issues.
- The new applicationSupportsSecureRestorableState override in AppDelegate.swift seems unrelated to folder permissions, so please confirm its necessity or move it to a separate PR.

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