chore(design-sync): add Reactive Resume UI sync inputs (#3216)

* chore(design-sync): add Reactive Resume UI sync inputs

Sync inputs for the claude.ai/design "Reactive Resume" project — the
@reactive-resume/ui design system (39 primary components).

- .design-sync/config.json — converter config (synth-entry, 202->39 card
  prune, overlay/grid cardMode overrides, cssEntry, tsconfig, buildCmd)
- .design-sync/build-css.mjs + tw-entry.css — compile Tailwind v4 globals.css
  to a self-contained stylesheet (inlined IBM Plex font), emit real .d.ts,
  and create the workspace self-symlink the converter needs
- .design-sync/previews/*.tsx — 39 authored preview compositions
- .design-sync/conventions.md — design-agent usage header (readmeHeader)
- .design-sync/NOTES.md — re-sync notes, gotchas, and risks
- packages/ui/tsconfig.emit.json — declaration emit for real prop contracts

Build artifacts (dist/types, .ds-compiled.css, ds-bundle, .cache) are gitignored.

Claude-Session: https://claude.ai/code/session_01R8Aq8F1nTuvJwfut7g3DVE

* chore(knip): ignore .design-sync inputs and drop stale es-toolkit ignore

- Ignore .design-sync/** (design-sync tooling: build-css.mjs + authored
  previews are standalone, not part of the app import graph — knip --fix was
  deleting them and failing the autofix job).
- Remove es-toolkit from apps/server ignoreDependencies: it's now really used
  (apps/server/src/http/health.ts imports withTimeout), so the ignore is stale.

Claude-Session: https://claude.ai/code/session_01R8Aq8F1nTuvJwfut7g3DVE

.design-sync/previews/Bubble.tsx

@@ -0,0 +1,47 @@
+import { Bubble, BubbleContent, BubbleGroup, BubbleReactions } from "@reactive-resume/ui/components/bubble";
+
+const wrap: React.CSSProperties = { display: "flex", flexDirection: "column", gap: 8, padding: 16, width: 420 };
+
+export const Conversation = () => (
+	<div style={wrap}>
+		<BubbleGroup>
+			<Bubble align="end">
+				<BubbleContent>Can you make my summary sound more senior without exaggerating?</BubbleContent>
+			</Bubble>
+			<Bubble variant="muted" align="start">
+				<BubbleContent>
+					I tightened it to lead with scope and outcomes. Want me to mirror that tone in your experience bullets too?
+				</BubbleContent>
+			</Bubble>
+			<Bubble align="end">
+				<BubbleContent>Yes, keep it concise.</BubbleContent>
+			</Bubble>
+		</BubbleGroup>
+	</div>
+);
+
+export const Variants = () => (
+	<div style={wrap}>
+		<Bubble variant="default" align="end">
+			<BubbleContent>Applied 3 edits to your resume.</BubbleContent>
+		</Bubble>
+		<Bubble variant="tinted" align="start">
+			<BubbleContent>I emphasized measurable launch outcomes in your last role.</BubbleContent>
+		</Bubble>
+		<Bubble variant="outline" align="start">
+			<BubbleContent>Draft saved — publish when you're ready.</BubbleContent>
+		</Bubble>
+		<Bubble variant="destructive" align="start">
+			<BubbleContent>Couldn't reach the AI provider. Retry?</BubbleContent>
+		</Bubble>
+	</div>
+);
+
+export const WithReactions = () => (
+	<div style={{ padding: 24, width: 420 }}>
+		<Bubble variant="secondary" align="start">
+			<BubbleContent>Rewrote your headline to target a Senior Product Manager role.</BubbleContent>
+			<BubbleReactions>👍 2</BubbleReactions>
+		</Bubble>
+	</div>
+);