#3330 fix: make find escape behavior consistent

Summary

• Make Escape close terminal find even when the query is non-empty.
• Restore browser web-view focus after hiding browser find.
• Add an E2E regression for terminal and browser find Escape behavior.

Testing

• python3 scripts/swift_file_length_budget.py --budget .github/swift-file-length-budget.tsv
• git diff --check
• ./scripts/reload.sh --tag task-cmd-f-escape-find-consistency

Issues

• Reported in chat: terminal and browser Cmd+F Escape behavior differed.

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Summary by cubic

Escape now consistently closes and clears Find in terminal and browser. Reopening restores the last query and caret/selection across refocus, pane handoffs, and field remounts.

• Bug Fixes

  • Terminal: Plain Escape closes Find when terminal owns focus (cmuxCloseFocusedTerminalFindForEscape); surface ESC fallback clears Find (IME‑safe) and restores focus. Cmd+F seeds from lastSearchNeedle via startOrFocusTerminalSearch(initialNeedle:). Selection is remembered before pane‑focus shortcuts and restored on refocus/remount (before any key replay); field editor ownership is tracked for stability.
  • Browser: startFind seeds from lastSearchNeedle and select‑all only when a recovered query is non‑empty. hideFind restores WebView focus only if Find had focus. Caret/selection are persisted across editor reuse and focus handoffs via FindSelectionTrackingTextField; Escape stores selection before closing.

• Tests

  • E2E cover Escape close‑and‑clear with focus restore, query recovery on reopen, and preserving caret/selection on repeated Cmd+F, pane handoff, and field remount; waits for the field before assertions; responder snapshot data exposed for UI assertions.

Summary by CodeRabbit

• Bug Fixes

  • Escape now reliably closes Find and clears the query in both terminal and browser panes.
  • Dismissal more reliably restores focus to page/terminal as expected and avoids spurious selection resets.
  • Terminal Escape behavior tightened for consistent focus routing.

• New Features

  • Previous search text is preserved and restored when reopening Find; repeated open preserves prior selection instead of replacing it.
  • Find text selection is preserved across edits and focus changes.

• Tests

  • UI tests added validating Escape behavior and selection/restore across panes.