Production tooltips: styled tooltips everywhere, shortcuts surfaced, dev-speak culled

Owner-approved full pass (tooltip wave, 2026-09-25). Mechanism: icon/pill
controls ride the styled Radix tooltip via a new Hint composition
(components/ui/hint.tsx) — the shared primitive adopted as-is, no
restyling; the shortcut appends as an em-dash suffix off the LIVE registry
(a rebind in Settings → Keyboard changes the suffix): "Dictate — ⌘D".
Surface-owned keys (Esc closes, Enter submits) ride a raw binding prop.
Native title= stays only for truncation-reveals (dock spans, the rename
field) and menu-interior abbreviations (MenuShell untouched). One
em-dash pattern; per-state truth on the send square (busy = "Stop the
reply — Esc", idle = "Send — ↵"), Enter on the plan verdict's accept,
"Stop dictation (Esc)" kept verbatim per the owner's flag.

Copy: the dev-speak cull — no pipeline/prober/tier/wave vocabulary
anywhere a user reads. New pins in tests/tooltip-mechanism.test.tsx
(hintText composition, asChild no-wrapper-DOM, the auto-update hint
constant); dock truncation titles pinned native; graph-chrome + settings
pins updated to the new copy.

Live-verified on :3001 — 12.6ms hover appearance (no native 1s lag);
glyphs render on every suffixed surface (⌘D, ⌘K, ⌘⇧F, ⌘,, ⌘B, F2, ↵,
Esc); per-page probes confirm Settings entry, Home logo, session search,
Start session, Close sidebar, model + thinking pills, stats summary,
rename title, plan chip, coverage ring, send square, cost button, node
search (⌘F), graph gear, settings close (Close — Esc), keyboard section
"Fixed — part of this screen", auto-update hint, light-mode "Coming
soon", the three slot rosters, graph-tools hint. Esc still closes the
settings dialog.

components/model-picker.tsx

@@ -7,6 +7,7 @@ import { prettyModel } from "@/components/usage-format";
 import { ModelMenuList, ThinkingMenuList } from "@/components/settings/model-menu";
 import { composeSlotModel } from "@/components/settings/agent-section";
 import { MenuShell } from "@/components/menu-shell";
+import { Hint } from "@/components/ui/hint";
 import { notifySettingsSaved, useSettingsSaved } from "@/components/settings-signal";
 import { defaultOrderLevel, populateLevel, THINKING_LABEL } from "@/components/thinking-default";
 
@@ -252,12 +253,18 @@ export function ModelControl() {
 
 	return (
 		<div ref={containerRef} className="relative flex items-center gap-1.5" data-testid="model-control">
-			<button
+			<Hint
+				// User language (tooltip wave): no tier/prober vocabulary. ⌘K
+				// opens this same menu (registry, override-aware).
+				label="The main model for your sessions"
+				action="open-model-picker"
+				side="bottom"
+			>
+				<button
 				type="button"
 				data-testid="stats-model"
 				onClick={() => openMenu("model")}
 				aria-expanded={open === "model"}
-				title="Strong tier model (prober + teacher) — set app-wide"
 				// Chrome look (owner, fix wave round 3): matches the graph
 				// view's floating top-right buttons (import notes, gear,
 				// coverage) — blurred, fuller opacity, shadowed — so the
@@ -267,7 +274,13 @@ export function ModelControl() {
 				<span className="text-card-foreground">{effectiveId ? prettyModel(effectiveId) : "—"}</span>
 				<span aria-hidden className="text-xs text-muted-foreground">▾</span>
 			</button>
-			<button
+			</Hint>
+			<Hint
+				// User language (tooltip wave) — no "tier" vocabulary.
+				label="How much the main model thinks"
+				side="bottom"
+			>
+				<button
 				type="button"
 				data-testid="stats-thinking"
 				onClick={() => {
@@ -277,7 +290,6 @@ export function ModelControl() {
 					openMenu("thinking");
 				}}
 				aria-expanded={open === "thinking"}
-				title="Strong tier thinking level — set app-wide"
 				// Chrome look (owner, fix wave round 3): matches the graph
 				// view's floating top-right buttons (import notes, gear,
 				// coverage) — blurred, fuller opacity, shadowed — so the
@@ -291,6 +303,7 @@ export function ModelControl() {
 				</span>
 				<span aria-hidden className="text-xs text-muted-foreground">▾</span>
 			</button>
+			</Hint>
 
 			{/* The shared dropdown body (extracted 2026-09-20): the agent
 			    settings' slot selects and the setup dialog use the exact same