feat: diary entry export functionality and settings integration

[SmilingPixel]

This pull request introduces diary entry export functionality and refines the handling of local file URIs for image loading. The main changes are the addition of diary entry export (with Android implementation), improvements to the LocalFileFetcher to enforce stricter URI validation and enhance security, and updates to UI and tests to support these features.

Diary Entry Export Functionality:

• Added a cross-platform diary entry export API in DiaryEntryExport.kt, including result types and logic for exporting diary entries as files.
• Implemented Android-specific export logic in DiaryEntryExport.android.kt, which writes exported files to a cache directory and launches the Android share sheet. [1] [2]
• Added an "Export Diary Entries" button to the SettingsScreen, which invokes the export functionality and displays results to the user. [1] [2] [3]

Local File URI Handling and Security:

• Refined LocalFileFetcher.Factory to only accept canonical, safe URIs of the form localfile:///filename, rejecting URIs with authorities, nested paths, or directory traversal attempts. Updated documentation and logic accordingly.
• Updated regular expressions and usages in EntryDetailsScreen to match the stricter URI format.
• Improved error logging to avoid exceptions if logging fails.
• Updated comments and test cases to reflect the new URI requirements. [1] [2] [3]

Repository and Sync Improvements:

• Updated DiaryRepository to accept a SettingsRepository and pass it to sync tombstone recording, improving dependency management. [1] [2] [3]
• Renamed and documented the sync entry file name builder for consistency and reuse across export and sync features. [1] [2] [3]

Test and Documentation Updates:

• Expanded test coverage for LocalFileFetcher to ensure only valid URIs are accepted and unsafe or malformed URIs are rejected. [1] [2]
• Updated documentation and comments throughout the codebase for clarity and accuracy regarding URI formats and export behavior. [1] [2]

These changes collectively add user-facing diary export capabilities, harden file loading security, and improve code clarity and maintainability.

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Pull request overview

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