feat(dashboard): complete frontend redesign for Issue #271

- +layout.svelte: Upload button in header (authenticated users only)
- +page.server.ts: call /api/dashboard/resume, /pulse, /activity;
  remove deprecated /api/documents/incomplete and /recent-activity
- +page.svelte: 2-col grid layout (main + 320px sidebar), greeting,
  DashboardFamilyPulse + DashboardActivityFeed in sidebar
- DashboardResumeStrip: refactored to use server data (resumeDoc prop),
  SVG thumbnail, progress bar with aria-*, empty state, CTA
- DashboardFamilyPulse: new component — weekly stats from audit_log
- DashboardActivityFeed: new component — activity feed with "für dich" badge
- Update specs for new data shapes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/+layout.svelte

@@ -28,7 +28,9 @@ onMount(() => {
 });
 
 const isAuthPage = $derived(
-	['/login', '/forgot-password', '/reset-password'].some((p) => page.url.pathname.startsWith(p))
+	['/login', '/register', '/forgot-password', '/reset-password'].some((p) =>
+		page.url.pathname.startsWith(p)
+	)
 );
 
 const userInitials = $derived.by(() => {
@@ -50,6 +52,30 @@ const userInitials = $derived.by(() => {
 
 					<!-- Right Side -->
 					<div class="flex items-center gap-3">
+						{#if data?.user}
+							<a
+								href="/documents/new"
+								class="inline-flex items-center gap-2 rounded-sm border border-white/25 px-3.5 py-1.5 font-sans text-[11px] font-bold tracking-[.12em] text-white uppercase transition-colors hover:bg-white/10"
+							>
+								<svg
+									xmlns="http://www.w3.org/2000/svg"
+									width="14"
+									height="14"
+									viewBox="0 0 24 24"
+									fill="none"
+									stroke="currentColor"
+									stroke-width="2.5"
+									stroke-linecap="round"
+									stroke-linejoin="round"
+									aria-hidden="true"
+								>
+									<path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
+									<polyline points="17 8 12 3 7 8" />
+									<line x1="12" y1="3" x2="12" y2="15" />
+								</svg>
+								Hochladen
+							</a>
+						{/if}
 						<!-- Language selector (desktop only — mobile lives in nav drawer) -->
 						<div
 							class="hidden items-center gap-1 pr-3 lg:flex [&_button]:px-1.5 [&_button]:py-1 [&_button]:text-xs"