style(dashboard): address @leonievoss — scale fallback icon to match larger container

h-16 w-16 looked undersized in the 180×252 strip container (~25% of
the height). h-24 w-24 gives ~38% visual weight, matching the ratio
DocumentThumbnail uses for its lg (120×168) fallback (#309).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/lib/components/DashboardResumeStrip.svelte

@@ -68,7 +68,7 @@ function safeColor(color: string): string {
 						viewBox="0 0 24 24"
 						stroke-width="1.5"
 						stroke="currentColor"
-						class="h-16 w-16"
+						class="h-24 w-24"
 					>
 						<path
 							stroke-linecap="round"