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).

tests/render-cards.test.tsx

@@ -146,7 +146,7 @@ describe("render smoke tests", () => {
 		assert.match(html, /Why this answer\? What are you unsure about\?/, "placeholder invites, not apologizes");
 		assert.ok(!html.includes("optional"), "the field is never called optional");
 		assert.match(html, /Submit answer/, "send becomes Submit answer");
-		assert.match(html, /⌘\/Ctrl \+ ↵ submits/, "the ⌘/Ctrl+Enter shortcut is discoverable");
+		assert.match(html, /↵ submits · ⇧↵ newline/, "the standard chord is discoverable (owner round 5)");
 		// The v1 desync bug: options are buttons with ARIA roles, not native inputs.
 		assert.ok(!html.includes('type="radio"'), "no native radio inputs");
 		assert.ok(html.includes('role="radio"'), "button-based radio role present");