fix: files grid cards now stretch to fill full width like photos view

- grid-template-columns: minmax(200px, 240px) → minmax(200px, 1fr)
- Remove justify-content: start (no longer needed with 1fr)

static/css/components/cards.css

@@ -1,9 +1,8 @@
 /* Files grid */
 .files-grid {
 	display: grid;
-	grid-template-columns: repeat(auto-fill, minmax(200px, 240px));
+	grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
 	gap: 20px;
-	justify-content: start;
 	position: relative;
 }