Move Find, Find Next, Find Previous from Ghostty binding lookups to the app's own keybinding system (AppShortcuts + ResolvedKeybindingMap). This makes them configurable in Settings > Shortcuts, provides proper menu keyboard shortcuts regardless of ghostty_config_trigger limitations, and prevents key leaking to the PTY via the menu consumption path. - Add startSearch, findNext, findPrevious command IDs with Cmd+F, Cmd+G, Cmd+Shift+G defaults to AppShortcuts - Switch TerminalCommands to use resolvedKeybindings for search items - Update search overlay tooltips to reflect configured shortcuts - Remove hardcoded fallback shortcuts (now handled by AppShortcuts defaults)