fix minor bugs found by CodeRabbit

[AlanRockefeller]

Summary by CodeRabbit

• Bug Fixes

  • Fixed grid-to-loupe view transitions with improved state management
  • Added safety guards for grid actions
  • Refined shift-click selection behavior
  • Strengthened JSON validation

• Performance & Improvements

  • Optimized JPEG decoding with accelerated processing path
  • Enhanced image format support with robust fallback handling
  • Improved theme consistency across grid interface
  • Updated EXIF dialog font rendering
  • Better error handling and logging for image operations

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[coderabbitai]

Walkthrough

The pull request introduces a JPEG-specific fast-path with TurboJPEG and Pillow fallback for image decoding, refactors grid-to-loupe state transitions with proper prefetch sequencing, adds theme propagation throughout QML grid view components, improves error handling in metadata and folder statistics parsing, and adjusts test fixtures to reduce unnecessary dependencies.

Changes

Cohort / File(s)	Summary
Core App Logic faststack/app.py	Modified grid_open_index to switch to loupe view first via _set_grid_view_active(False) before loading image, changing state reset and prefetch timing. Enhanced _get_metadata_dict exception handling with debug logging.
Image Decoding & Prefetch faststack/imaging/prefetch.py	Introduced JPEG-specific fast path using mmap + TurboJPEG with fallback to decode_jpeg_resized for resizing. Added Pillow-based fallback for non-JPEG formats with try/except error logging and timing instrumentation.
QML Theme Propagation faststack/qml/Main.qml, faststack/qml/ThumbnailGridView.qml, faststack/qml/ThumbnailTile.qml	Added isDarkTheme property binding throughout grid components to propagate theme from root. Replaced selection-tracking with lightweight selectedCount property. Added guards to grid action handlers.
QML Styling faststack/qml/ExifDialog.qml	Changed TextArea font family from "Consolas, monospace" to "Monospace".
Test Fixture Refactoring faststack/tests/thumbnail_view/test_folder_stats.py, faststack/tests/thumbnail_view/test_model.py, faststack/tests/thumbnail_view/test_prefetcher.py, faststack/tests/thumbnail_view/test_selection.py	Removed unused fixture parameters (temp_folder, cache). Replaced time.sleep-based cache invalidation with explicit os.utime file modification. Tightened Shift+click selection assertion.
Public API & Validation faststack/thumbnail_view/__init__.py, faststack/thumbnail_view/folder_stats.py, faststack/thumbnail_view/provider.py	Exposed PathResolver in package public API. Added JSON root dictionary validation in _parse_faststack_json. Added TYPE_CHECKING import and MD5 hash suppression comments in provider.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• #35: Modifies grid/thumbnail view implementation and app.py grid transition logic with coordinated QML component changes.
• #12: Changes image decoding paths in prefetch.py with TurboJPEG and fallback mechanisms.
• #7: Expands image decoding paths with TurboJPEG, mmap, and Pillow fallbacks with error logging.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title is vague and generic, using non-descriptive language ('minor bugs') that doesn't convey meaningful information about the specific changes across multiple files.	Consider a more specific title that highlights the primary change, such as 'Improve image prefetching, error handling, and UI state management' or listing the main functional improvements.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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