feat(ui): migrate entire UI to "Cozy Home" design

Warm, friendly redesign replacing the generic cold-shadcn look. Built as a
swappable token bundle so other presets can be added later; dark mode and the
user-tunable accent hue are retained.

Foundation
- app.css: warm cream (light) + "dusk" (dark) token system; terracotta accent
  (default hue 16); pastel --room-* palette; vivid --status-* (dots/bars) plus
  AA-legible --status-*-ink (text); soft warm shadows; --radius 1rem; font tokens
- Fonts: Fraunces (display) + Figtree (body), self-hosted in static/fonts
  (no Google CDN) so offline/LAN installs work; system-ui fallbacks kept
- h1/h2/h3 render in Fraunces via base layer

Chrome and surfaces
- Sidebar, Header, home, AppCard/BoardCard, BoardHeader, sections, favorites
- 29 widgets + integration renderers: cozy card shells, room-palette charts
- Default background is a static warm "cozy" glow (mesh demoted, rAF gated on
  prefers-reduced-motion)

System-wide
- Status colors tokenized (no raw bg/text-*-500 or status hex); success/warning
  to status tokens, categorical to room palette, errors to destructive
- Inputs rounded-xl; buttons rounded-xl; cards/dialogs rounded-[1.4rem];
  soft-shadow vocabulary only; focus-visible:ring-primary/30
- Forms, admin tables (now cozy cards), dialogs, popovers, auth screens

a11y: reduced-motion guards; darker status "ink" text for AA on cream.
Known tradeoff: terracotta primary + white button text ~2.96:1 (signature color,
user-tunable).

Verified: svelte-check 0/0, build ok, 274 tests pass, eslint 0 errors.
Design refs + system sheet in design-mockups/.

src/lib/components/ui/EntityPicker.svelte

@@ -130,7 +130,7 @@
 
 <button
 	type="button"
-	class="flex w-full items-center gap-2 rounded-md border border-input bg-background px-3 py-2 text-sm text-foreground transition-colors hover:border-primary focus:outline-none focus:ring-2 focus:ring-ring"
+	class="flex w-full items-center gap-2 rounded-xl border border-input bg-background px-3 py-2 text-sm text-foreground transition-colors hover:border-primary focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/30"
 	onclick={openPicker}
 >
 	{#if selectedItem}
@@ -157,7 +157,7 @@
 		style="animation: epFadeIn 0.15s ease-out"
 	>
 		<div
-			class="flex w-full max-w-md flex-col rounded-lg border border-border bg-popover shadow-2xl"
+			class="flex w-full max-w-md flex-col rounded-[1.4rem] border border-border bg-popover shadow-[var(--shadow-lift)]"
 			style="max-height: 60vh; animation: epSlideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1)"
 			role="dialog"
 			aria-label={searchPlaceholder || 'Select entity'}