Add/stashed file preview

[ozgen]

Added

• Accordion-style Stashes view
  • Stashes are now expandable nodes instead of a flat list.
  • Expanding a stash reveals the files contained within it.
• Per-file diff preview in Stashes view
  • Clicking a stashed file opens a diff against the stash base commit.
  • Newly added files in a stash open as single-file preview.
• Status-aware stash file nodes (A/M/D/R/C).

Changed

• Stash nodes are now collapsible instead of non-expandable items.
• Refactored Stashes tree provider to support hierarchical rendering.
• Extended Git adapter with git diff --name-status integration for stash file enumeration.

Improved

• Safer handling of very large stashed files to prevent preview crashes.
• Increased unit test coverage for stash tree rendering and Git stash parsing logic.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 87.17949% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.15%. Comparing base (75e452b) to head (0449937).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/adapters/git/gitCliClient.ts	80.00%	0 Missing and 4 partials ⚠️
src/views/stash/stashesTreeProvider.ts	66.66%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   91.47%   91.15%   -0.32%     
==========================================
  Files          37       37              
  Lines         997     1029      +32     
  Branches      231      243      +12     
==========================================
+ Hits          912      938      +26     
- Misses         17       18       +1     
- Partials       68       73       +5     

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