The chord previously only acted when a terminal or preview selection
existed. A new bubble-phase window fallback now moves focus to the
composer on an unclaimed press, like the address-bar chord in a browser.
Existing owners keep priority: selection handlers claim the press on the
capture phase, a user-rebound action marks the event handled, and a
focused terminal with no selection keeps Ctrl+L as clear-screen via
composerFocusBlockedBySurface().
The chord matcher moves from the terminal feature to
src/lib/keybinds/chords.ts as isComposerChord: it now has three
consumers and the old name (isAddSelectionShortcut) was wrong at the
composer call site. The fixed panel row view.terminalSelection becomes
view.selectionToComposer because it covers preview selections too.
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