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/md-blocks.tsx

@@ -40,6 +40,7 @@ import type { ExtraProps } from "streamdown";
 import { MERMAID_FONT_SIZE, renderMermaid } from "@/components/mermaid-render";
 import { MermaidError } from "@/components/mermaid-error";
 import { chartSize, useSessionMermaid } from "@/components/session-overlay";
+import { Hint } from "@/components/ui/hint";
 
 // ─── The one affordance: the hover-reveal corner copy ────────────────────────
 
@@ -198,16 +199,22 @@ function MermaidInline({ chart }: { chart: string }) {
 			<div className="absolute top-0 right-0 flex items-start gap-0.5">
 				<CopyCorner getText={() => chart} label="Copy diagram source" />
 				{overlay && (
-					<button
+					<Hint
+					// Full-screen overlay copy (tooltip wave) — "session view" was
+					// internal direction-speak for the same thing.
+					label="Open full-screen"
+					side="bottom"
+				>
+<button
 						type="button"
 						aria-label="Expand diagram"
 						data-testid="md-mermaid-expand"
-						title="Expand into the session view"
-						className="flex size-6 items-center justify-center rounded-md text-muted-foreground/70 opacity-0 transition-opacity hover:bg-accent hover:text-foreground group-hover/md:opacity-100"
+												className="flex size-6 items-center justify-center rounded-md text-muted-foreground/70 opacity-0 transition-opacity hover:bg-accent hover:text-foreground group-hover/md:opacity-100"
 						onClick={() => overlay.openMermaid(chart)}
 					>
 						<MaximizeIcon className="size-3.5" />
 					</button>
+				</Hint>
 				)}
 			</div>
 		</div>