style(frontend): format manifest.webmanifest with prettier

`frontend/static/manifest.webmanifest` was not prettier-formatted (2-space
indent vs the repo's tab style), so `npm run check`'s `prettier --check .`
step — and therefore the frontend CI job — fails on it for every PR. Run
`prettier --write` to bring it in line. Whitespace only; no semantic change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/static/manifest.webmanifest

@@ -1,42 +1,42 @@
 {
-  "name": "OxiCloud",
+	"name": "OxiCloud",
-  "short_name": "OxiCloud",
+	"short_name": "OxiCloud",
-  "description": "Fast, private cloud storage built with Rust.",
+	"description": "Fast, private cloud storage built with Rust.",
-  "start_url": "/",
+	"start_url": "/",
-  "scope": "/",
+	"scope": "/",
-  "display": "standalone",
+	"display": "standalone",
-  "background_color": "#0f172a",
+	"background_color": "#0f172a",
-  "theme_color": "#0f172a",
+	"theme_color": "#0f172a",
-  "icons": [
+	"icons": [
-    {
+		{
-      "src": "/logo/logo-plain.svg",
+			"src": "/logo/logo-plain.svg",
-      "sizes": "any",
+			"sizes": "any",
-      "type": "image/svg+xml",
+			"type": "image/svg+xml",
-      "purpose": "any"
+			"purpose": "any"
-    },
+		},
-    {
+		{
-      "src": "/logo/logo-maskable.svg",
+			"src": "/logo/logo-maskable.svg",
-      "sizes": "any",
+			"sizes": "any",
-      "type": "image/svg+xml",
+			"type": "image/svg+xml",
-      "purpose": "maskable"
+			"purpose": "maskable"
-    },
+		},
-    {
+		{
-      "src": "/logo/maskable-192.png",
+			"src": "/logo/maskable-192.png",
-      "sizes": "192x192",
+			"sizes": "192x192",
-      "type": "image/png",
+			"type": "image/png",
-      "purpose": "maskable"
+			"purpose": "maskable"
-    },
+		},
-    {
+		{
-      "src": "/logo/maskable-512.png",
+			"src": "/logo/maskable-512.png",
-      "sizes": "512x512",
+			"sizes": "512x512",
-      "type": "image/png",
+			"type": "image/png",
-      "purpose": "maskable"
+			"purpose": "maskable"
-    },
+		},
-    {
+		{
-      "src": "/logo/maskable-512.png",
+			"src": "/logo/maskable-512.png",
-      "sizes": "512x512",
+			"sizes": "512x512",
-      "type": "image/png",
+			"type": "image/png",
-      "purpose": "any"
+			"purpose": "any"
-    }
+		}
-  ]
+	]
 }