[eas-cli] fix git diff header in fingerprint:compare

[quinlanj]

Why

The current git-style diff output in the fingerprint diff utility shows incorrect line numbers in the chunk headers. This affects the readability and accuracy of diff representations when comparing fingerprints.

How

Updated the chunk header calculation in fingerprintDiff.ts to properly account for context lines when determining the line ranges. The fix adjusts both the starting position and total line count by incorporating the context lines in the calculations.

The changes ensure that:

• Starting positions are offset by the number of prior context lines
• Total line counts include both context lines and modified lines
• Default starting position is 1 when undefined

Test Plan

• Ran EXPO_STAGING=1 ~/Documents/eas-cli/packages/eas-cli/bin/run fingerprint:compare 796b89315aeaa4b466aa3ac6c2dcff5cf9ed4c8e d5de1b929c0346251e400eed13205fda4eaf51bf and ensure diff header is correct

[quinlanj]

• [eas-cli] fix git diff header in fingerprint:compare #2915 👈 (View in Graphite)
• main

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[github-actions]

Size Change: +2.35 kB (0%)

Total Size: 53.5 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	53.5 MB	+2.35 kB (0%)

_{compressed-size-action}

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@szdziedzic, @khamilowicz, @sjchmiela, @radoslawkrzemien

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[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.64%. Comparing base (3ac6472) to head (0d74622).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2915      +/-   ##
==========================================
+ Coverage   52.63%   52.64%   +0.01%     
==========================================
  Files         588      588              
  Lines       23202    23203       +1     
  Branches     4860     4860              
==========================================
+ Hits        12211    12212       +1     
  Misses      10022    10022              
  Partials      969      969              

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