Tooltip subtlety round: 500ms rest delay, quiet chip, parens suffixes, drops + trims

Owner round 2026-09-25, over 09c0f6e. The wave's tooltips read as
distracting; this round makes them quiet:

- Delay: TOOLTIP_DELAY_MS = 500 in the primitive — tooltips appear when
  you pause on a control, never in passing (Radix focus-opens stay
  instant by design; keyboard users don't wait).
- Vanish on leave: disableHoverableContent — the chip is un-hoverable,
  so the instant the cursor leaves the trigger it's gone, even mid-move
  onto the chip's own pixels.
- Look: bg-accent (#2a2a2a, the hover-chip tone) instead of the white
  bg-foreground slab; 11px; px-2 py-1; arrow culled (nothing purely
  decorative); text-foreground/85.
- Suffix: parentheses, not em-dash — "Dictate (⌘D)"; the registry
  source unchanged (still override-aware).
- Drops (owner-selected): send square, start square, stats summary —
  the icons/numbers describe themselves.
- Home logo kept but to the RIGHT with its real shortcut "Home (⌘G)"
  (jump-graph routes to /, the same destination).
- Trims: "Model selector (⌘K)", "Thinking level", "Graph costs —
  click for details", "How much of this session isn't mapped yet".
- Added: Import Notes gets "Import notes into the graph" — the one
  button whose destination wasn't obvious.

Pins: TOOLTIP_DELAY_MS=500; hintText parens expectations updated.
Live-verified on :3001 — 508ms hover delay measured, close within 10ms
of pointerout, chip styles probed (rgb(42,42,42), 11px, 4px/8px), arrow
gone, all new labels + sides confirmed, drops carry no tooltip and no
aria-describedby.

components/composer.tsx

@@ -133,18 +133,13 @@ export function Composer({
 					</button>
 				</div>
 			) : (
-				<Hint
-					// Per-state truth (tooltip wave): busy → the square STOPS the
-					// stream, and Esc aborts it too; otherwise Enter sends when the
-					// box has text.
-					label={busy ? "Stop the reply" : "Send"}
-					binding={busy ? "escape" : "enter"}
-					side="left"
-				>
-					<button
-						type="submit"
-						aria-label={busy ? "Stop" : "Send"}
-						disabled={!busy && !canSend}
+				// No tooltip on the send square — the ↵ glyph is the
+				// affordance and Enter is obvious (owner, subtlety
+				// round 2026-09-25).
+				<button
+					type="submit"
+					aria-label={busy ? "Stop" : "Send"}
+					disabled={!busy && !canSend}
 					className={cn(
 						"flex size-10 shrink-0 items-center justify-center rounded-[10px] transition-colors",
 						busy
@@ -154,7 +149,6 @@ export function Composer({
 				>
 					{busy ? <SquareIcon className="size-4" /> : <CornerDownLeftIcon className="size-5" />}
 				</button>
-				</Hint>
 			)}
 		</form>
 	);