feat(editor): add find and replace to the search bar

[Gimics]

What

Adds find & replace to the editor's search bar. For editor tabs the bar now has case-sensitive, whole-word, and regex toggles plus an expandable replace row (Replace / Replace All). Cmd/Ctrl+H opens it directly, and selecting text before Cmd/Ctrl+F or Cmd/Ctrl+H prefills the query. Terminal and git-history search are unchanged.

Why

The search bar could only find in the editor — there was no way to replace text without leaving the app. The project-wide search work (#688, closes #128) shipped read-only and explicitly listed find-and-replace as out of scope, leaving the single-file editor case unaddressed.

Reuses CodeMirror's existing @codemirror/search state, so it adds no new dependency. Scope is deliberately single-file editor find/replace — not IDE-scale project-wide search.

How

• SearchInline renders modifier toggles + an expandable replace row for editor targets only; terminal / git-history paths are untouched. Search application is centralized in one effect.
• EditorPaneHandle.setQuery(q, opts) carries the modifiers + replacement into the CodeMirror SearchQuery, and adds replaceNext / replaceAll. A small dedup ref stops the selection jumping while you type in the replace field.
• New search.replace shortcut = Cmd/Ctrl+H, gated in shortcutsDisabled to editor focus so Ctrl+H stays backspace (^H) in the terminal.
• Selection prefill uses the existing getSelection() (editor + terminal).
• basicSetup.searchKeymap is disabled so CodeMirror's built-in panel no longer competes with the header bar — one find/replace surface.
• Relabels the Cmd/Ctrl+F shortcut from "Find in terminal" to "Find" — it already focused search for the editor and git-history views too, so the old label was inaccurate even before this change.

Testing

• pnpm exec tsc --noEmit clean
• Manual smoke-test of the affected feature
• (If you touched src-tauri/) — N/A, no Rust changes
• (If you changed a #[tauri::command] signature) — N/A
• (If UI) tested in pnpm tauri dev
• Platforms tested: Windows
• Shells tested (if relevant): N/A

Manual flows exercised in pnpm tauri dev:

• Ctrl+F / Ctrl+H focus the bar; toggles (case / word / regex) update matches live; Enter / Shift+Enter cycle.
• Replace and Replace All modify the buffer; typing in the replace field does not jump the selection.
• Ctrl+H inside a focused terminal still deletes a character (backspace) — the binding is not hijacked there.
• Select text, then Ctrl+F / Ctrl+H → the query is prefilled from the selection.

pnpm test: 438 pass. (Two pre-existing eager-budget.test.ts failures on main are a parse error unrelated to this change.)

Screenshots

Notes for reviewer

• Default-behavior change: in an editor, Ctrl+F now always routes to the header search bar; CodeMirror's built-in search panel keymap is disabled. Flagging since it changes an existing interaction.
• No new dependencies — reuses @codemirror/search.
• Opened as a draft for direction/alignment feedback before polishing (per CONTRIBUTING's "open a draft PR early"). Happy to adjust scope.

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