fix(tui): copilot review on #16707 — naming, label consistency, esc priority

- Rename `removeAt` → `removeAtInPlace` and document the mutation
  contract; the old name read like a non-mutating helper.
- Hotkey table + queue header: use `Ctrl+X` / `Esc` to match the
  rest of the UI (was `⌃X` / `esc`).
- Render the queued header as a single template literal so JSX
  text-node whitespace can't sneak into the rendered line.
- Make `Esc` while editing beat the `terminal.hasSelection` clear:
  the header promises 'Esc cancel', so an active selection
  shouldn't silently consume the keystroke.

ui-tui/src/app/useInputHandlers.ts

@@ -307,14 +307,17 @@ export function useInputHandlers(ctx: InputHandlerContext): InputHandlerResult {
       return scrollTranscript(key.pageUp ? -step : step)
     }
 
-    if (key.escape && terminal.hasSelection) {
-      return clearSelection()
-    }
-
+    // Queue-edit cancel beats selection-clear: the queue header explicitly
+    // promises "Esc cancel", so honoring it takes priority over the implicit
+    // selection-dismissal convention. Without an active edit, fall through.
     if (key.escape && cState.queueEditIdx !== null) {
       return cActions.clearIn()
     }
 
+    if (key.escape && terminal.hasSelection) {
+      return clearSelection()
+    }
+
     if (key.upArrow && !cState.inputBuf.length) {
       const inputSel = getInputSelection()
       const cursor = inputSel && inputSel.start === inputSel.end ? inputSel.start : null