The header's 'Commit' button (onViewHistory) just switched
BranchDetailScreen's pager to page 1 -- the exact same action the
top-level 'Commit' tab's own onClick already performs. No path/file
info ever flowed through it, so it was never actually file-specific
history, just a duplicate shortcut that TASK-031's rename made obvious.
Removed the button, its parameter threading, and the now-unused
codebrowser_history string.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
