The in-editor Find bar gains a chevron at its left that expands and collapses the Replace row (Replace, Replace All, Exclude), replacing the separate Replace icon button. Cmd/Ctrl+F opens the bar collapsed and Cmd/Ctrl+R expanded; the search text, options and focus are kept when toggling. The chevron reports aria-expanded.
Fixes#362
Find in the diff viewer (⌘F / ⌘R / ⌘G) opens the editor's find bar instead of CodeMirror's search panel: same field, Match Case / Words / Regex, counter, navigation, filter menu and highlights. In the side-by-side viewer the bar sits over the side with the caret, Replace is offered only on editable sides, and the shortcuts come from the keymap. Esc closes the bar even while a match is selected.
Claude-Session: https://claude.ai/code/session_01Dq6jQQn8ZhRfkkyj3PRutA
Co-authored-by: jaw52 <[email protected]>