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/ResizableGroup.tsx

@@ -0,0 +1,56 @@
+import { ResizableGroup, ResizablePanel, ResizableSeparator } from "@reactive-resume/ui/components/resizable";
+
+const panelStyle: React.CSSProperties = { height: "100%", padding: 16, fontSize: 14, lineHeight: 1.6 };
+const label: React.CSSProperties = {
+	fontSize: 11,
+	fontWeight: 600,
+	textTransform: "uppercase",
+	letterSpacing: "0.05em",
+	color: "var(--muted-foreground)",
+	marginBottom: 8,
+};
+
+export const BuilderLayout = () => (
+	<div style={{ height: 240, width: 460, border: "1px solid var(--border)", borderRadius: 8, overflow: "hidden" }}>
+		<ResizableGroup orientation="horizontal">
+			<ResizablePanel defaultSize={40}>
+				<div style={panelStyle}>
+					<div style={label}>Editor</div>
+					<div>Basics</div>
+					<div>Work Experience</div>
+					<div>Education</div>
+					<div>Skills</div>
+				</div>
+			</ResizablePanel>
+			<ResizableSeparator withHandle />
+			<ResizablePanel defaultSize={60}>
+				<div style={{ ...panelStyle, background: "var(--muted)" }}>
+					<div style={label}>Live Preview</div>
+					<div style={{ fontWeight: 600, fontSize: 16 }}>Jordan Rivera</div>
+					<div style={{ color: "var(--muted-foreground)" }}>Senior Product Designer</div>
+				</div>
+			</ResizablePanel>
+		</ResizableGroup>
+	</div>
+);
+
+export const VerticalSplit = () => (
+	<div style={{ height: 240, width: 300, border: "1px solid var(--border)", borderRadius: 8, overflow: "hidden" }}>
+		<ResizableGroup orientation="vertical">
+			<ResizablePanel defaultSize={50}>
+				<div style={panelStyle}>
+					<div style={label}>Summary</div>
+					<div>Eight years building design systems and shipping delightful product experiences.</div>
+				</div>
+			</ResizablePanel>
+			<ResizableSeparator withHandle />
+			<ResizablePanel defaultSize={50}>
+				<div style={{ ...panelStyle, background: "var(--muted)" }}>
+					<div style={label}>Contact</div>
+					<div>jordan.rivera@email.com</div>
+					<div>San Francisco, CA</div>
+				</div>
+			</ResizablePanel>
+		</ResizableGroup>
+	</div>
+);