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/widget/ClockWeatherWidget.svelte

@@ -111,7 +111,7 @@
 	}
 </script>
 
-<div class="flex h-full flex-col items-center justify-center rounded-xl border border-border bg-card p-4">
+<div class="flex h-full flex-col items-center justify-center rounded-[1.4rem] border border-border bg-card shadow-[var(--shadow-soft)] p-4">
 	{#if clockStyle === 'analog'}
 		<!-- Analog clock face -->
 		<svg viewBox="0 0 100 100" class="h-32 w-32">
@@ -154,7 +154,7 @@
 		<p class="mt-2 text-xs text-muted-foreground">{dateStr}</p>
 	{:else}
 		<!-- Digital clock -->
-		<p class="font-mono text-4xl font-bold tabular-nums text-foreground">{timeStr}</p>
+		<p class="font-display text-4xl font-semibold tabular-nums text-foreground">{timeStr}</p>
 		<p class="mt-1 text-sm text-muted-foreground">{dateStr}</p>
 		{#if config.timezone}
 			<p class="mt-0.5 text-xs text-muted-foreground/70">{config.timezone.replace(/_/g, ' ')}</p>