ui: round 5 — AGENT'S THINKING buys the 3ch rail; the standard chord; dashed model names

- THE 3CH RAIL: 'AGENT’S THINKING' (16ch, flush) − 'YOUR THINKING' (13ch)
  = 3ch of mono — the rail widens to 3ch (border + padding), keeping the
  chevrons aligned while giving the quote room to breathe (the 1ch rail
  read cramped). YOU row follows.
- THE STANDARD CHORD everywhere: Enter submits, Shift+Enter is a
  newline, ⌘/Ctrl+Enter works too — the teaching thinking field drops
  the ⌘-only Gmail convention; the hint reads '↵ submits · ⇧↵ newline'
  in both docks, shown in text mode too (it Enter-submits as well).
- The transcript-end optimistic placeholder joins the register: small
  mono caps THINKING… (was text-sm sentence case).
- Model names keep their dashes: prettyModel renders 'glm-5.3-flash'
  exactly as written (no auto-caps, no dash→space join).

components/question-dock.tsx

@@ -820,9 +820,10 @@ function QuestionDockForm({
 									onEscape();
 									return;
 								}
-								// ⌘↵ on macOS, Ctrl↵ elsewhere — the Gmail convention; plain
-								// Enter stays a newline (this field is for dumping).
-								if (e.key === "Enter" && (e.metaKey || e.ctrlKey)) {
+								// THE STANDARD CHORD (owner round 5, 2026-10-05): Enter
+								// submits, Shift+Enter is a newline, ⌘/Ctrl+Enter works
+								// too — identical to the practice dock and the composer.
+								if (e.key === "Enter" && (!e.shiftKey || e.metaKey || e.ctrlKey)) {
 									e.preventDefault();
 									submit();
 								}
@@ -838,11 +839,9 @@ function QuestionDockForm({
 						/>
 					)}
 					<div className="flex items-center justify-between gap-2 p-1">
-						{qd.mode !== "text" && (
-							<span aria-hidden className="pl-1.5 text-xs text-muted-foreground">
-								⌘/Ctrl + ↵ submits
-							</span>
-						)}
+						<span aria-hidden className="pl-1.5 text-xs text-muted-foreground">
+								↵ submits · ⇧↵ newline
+						</span>
 						<Button
 							type="submit"
 							disabled={!canSubmit}