filter: use document text for encoding-safe filtering

[webispy]

Summary

• Pass document.getText() to LogProcessor.processFile via a new content option instead of reading files from disk with fs.createReadStream
• Fixes filter apply failures on Windows caused by file encoding mismatches
• Removes the untitled-file temp file workaround — now handled naturally via the content stream

Test plan

• Verify filter apply works on saved files (Windows & macOS)
• Verify filter apply works on untitled documents
• Verify workflow pipeline still works (uses file-based streaming, unaffected)
• Verify Windows CI passes

🤖 Generated with Claude Code

[github-actions]

📦 Artifact Ready

Download the extension package here:
logmagnifier-1.6.5-dev.20260324101210.vsix

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.31%. Comparing base (aadba0f) to head (5f9cdbd).

Files with missing lines	Patch %	Lines
src/services/LogProcessor.ts	85.71%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
- Coverage   59.38%   59.31%   -0.07%     
==========================================
  Files          59       59              
  Lines       14747    14707      -40     
  Branches     1014     1011       -3     
==========================================
- Hits         8758     8724      -34     
+ Misses       5969     5963       -6     
  Partials       20       20              

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