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/WidgetConfigPanel.svelte

@@ -72,7 +72,7 @@
 	let rssShowSummary = $state((initialConfig.showSummary as boolean) ?? true);
 
 	// Calendar
-	let calendarUrlsRaw = $state((initialConfig.icalUrls as Array<{ url: string; color: string; label: string }>) ?? [{ url: '', color: '#6366f1', label: '' }]);
+	let calendarUrlsRaw = $state((initialConfig.icalUrls as Array<{ url: string; color: string; label: string }>) ?? [{ url: '', color: '#e8754f', label: '' }]);
 	let calendarDaysAhead = $state((initialConfig.daysAhead as number) ?? 7);
 
 	// Markdown
@@ -155,7 +155,7 @@
 	}
 
 	function addCalendarUrl() {
-		calendarUrlsRaw = [...calendarUrlsRaw, { url: '', color: '#6366f1', label: '' }];
+		calendarUrlsRaw = [...calendarUrlsRaw, { url: '', color: '#e8754f', label: '' }];
 	}
 
 	function removeCalendarUrl(index: number) {
@@ -163,7 +163,7 @@
 	}
 
 	// Helper for input styling
-	const inputClass = 'w-full rounded-lg border border-input bg-background px-3 py-2 text-sm text-foreground placeholder:text-muted-foreground transition-colors focus:border-primary focus:outline-none focus:ring-2 focus:ring-ring/30';
+	const inputClass = 'w-full rounded-xl border border-input bg-background px-3 py-2 text-sm text-foreground placeholder:text-muted-foreground transition-colors focus:border-primary focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/30';
 	const labelClass = 'mb-1 block text-sm font-medium text-foreground';
 
 	let firstInput: HTMLElement | undefined = $state();
@@ -171,7 +171,7 @@
 </script>
 
 <div
-	class="rounded-xl border border-border bg-card p-4 shadow-lg"
+	class="rounded-xl border border-border bg-card p-4 shadow-[var(--shadow-soft)]"
 	transition:fade={{ duration: 100 }}
 	onkeydown={handleKeydown}
 	role="dialog"
@@ -201,11 +201,11 @@
 						bind:value={appSearchQuery}
 						bind:this={firstInput}
 						placeholder={$t('common.search') ?? 'Search apps...'}
-						class="w-full rounded-lg border border-input bg-background py-1.5 pl-8 pr-3 text-sm text-foreground placeholder:text-muted-foreground focus:border-primary focus:outline-none focus:ring-1 focus:ring-ring/30"
+						class="w-full rounded-xl border border-input bg-background py-1.5 pl-8 pr-3 text-sm text-foreground placeholder:text-muted-foreground focus:border-primary focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/30"
 					/>
 				</div>
 				<!-- App grid -->
-				<div class="max-h-48 overflow-y-auto rounded-lg border border-input bg-background p-1">
+				<div class="max-h-48 overflow-y-auto rounded-xl border border-input bg-background p-1">
 					{#if filteredApps.length === 0}
 						<p class="py-4 text-center text-xs text-muted-foreground">{$t('common.no_results') ?? 'No apps found'}</p>
 					{:else}
@@ -548,7 +548,7 @@
 			{$t('common.cancel') ?? 'Cancel'}
 		</button>
 		<button type="button" onclick={handleSave}
-			class="rounded-lg bg-primary px-3 py-1.5 text-sm font-medium text-primary-foreground transition-colors hover:bg-primary/90">
+			class="rounded-xl bg-primary px-3 py-1.5 text-sm font-medium text-primary-foreground transition-colors hover:bg-primary/90">
 			{mode === 'create' ? ($t('common.add') ?? 'Add') : ($t('common.save') ?? 'Save')}
 		</button>
 	</div>