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/home.tsx

@@ -5,7 +5,6 @@ import { useRouter } from "next/navigation";
 import { CornerDownLeftIcon } from "lucide-react";
 import { GraphView } from "@/components/graph-view";
 import { SetupDialog } from "@/components/setup-dialog";
-import { Hint } from "@/components/ui/hint";
 import { useStrongKeyless, useZeroKeys, ZeroKeysPill } from "@/components/setup-cta";
 import { useDefaultSettings } from "@/components/default-settings";
 import { DictationBar, useDictation } from "@/components/dictation";
@@ -177,21 +176,16 @@ export function Home({ initialSettings, initialConfigured }: { initialSettings:
 						rows={1}
 						className="field-sizing-content lh-input max-h-48 min-h-10 flex-1 resize-none bg-transparent px-2.5 py-2 outline-none placeholder:text-muted-foreground"
 					/>
-					<Hint
-						// Enter starts the session too (the form submits).
-						label="Start session"
-						binding="enter"
-						side="left"
-					>
-						<button
+					{/* No tooltip on the start square — the ↵ glyph is the
+					    affordance (owner, subtlety round 2026-09-25). */}
+					<button
 						type="submit"
 						aria-label="Start session"
 						disabled={!topic.trim() || busy}
 						className="flex size-10 shrink-0 items-center justify-center rounded-[10px] bg-primary text-primary-foreground transition-colors hover:opacity-90 disabled:opacity-40"
 					>
 						<CornerDownLeftIcon className="size-5" />
-						</button>
-					</Hint>
+					</button>
 					</form>
 					{/* Same as the chat view's under-composer stats bar (owner) — no
 					    session yet, so the LEFT side renders nothing (wave 7 sweep)