Astro 7, and stop a print-only instance calling a route it has switched off

The critical advisory in the dependency tree (GHSA-26w7-cxv4-gfx2, remote code
execution through AVIF image optimisation) has no fix inside Astro 5, so this
moves to Astro 7.3.2 with @astrojs/node 11 and current sharp. `npm audit` now
reports nothing. The only code the jump needed: `csp` graduated out of
`experimental`, and sharp's `Sharp` type is a named export now.

Also fixed, both found by testing with every module switched on rather than
only the print-only default:

- `src/pages/index.astro` passed `dict` to the studio island without ever
  defining it, so the studio page returned 500 on any instance with the AI
  module on. The print-only default redirects away from that page, which is
  why the earlier run never hit it.
- The print studio fetched `/api/delivery-targets` even with the delivery
  module off. The route answered 404 exactly as designed, but it left a red
  line in the console of every print-only instance, which reads like a fault.
  It now asks only when there is a module to ask, and hides the card otherwise.

Plus: the first-run box sizes itself to its content instead of miscounting
padding, and the README's counts are recounted rather than remembered.

Verified against a live instance on a fresh database, in both module sets:
sign-in, module gating, the German interface, an eight-up passport sheet and
its PDF. 124 tests, type check, build and secret scan all clean.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nh4A79bbqT9dcd2inzYUdg

package.json

@@ -38,14 +38,14 @@
     "scan": "node scripts/secret-scan.mjs"
   },
   "dependencies": {
-    "@astrojs/node": "^9.1.3",
-    "@astrojs/react": "^4.2.1",
+    "@astrojs/node": "^11.1.5",
+    "@astrojs/react": "^6.0.5",
     "@aws-sdk/client-s3": "^3.700.0",
     "@fontsource/space-grotesk": "^5.1.0",
     "@fontsource/space-mono": "^5.1.0",
     "archiver": "^7.0.1",
     "argon2": "^0.41.1",
-    "astro": "^5.5.0",
+    "astro": "^7.3.2",
     "basic-ftp": "^5.0.5",
     "grammy": "^1.30.0",
     "heic-convert": "^2.1.0",
@@ -55,7 +55,7 @@
     "pg-boss": "^10.1.5",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
-    "sharp": "^0.33.5",
+    "sharp": "^0.35.4",
     "ssh2-sftp-client": "^11.0.0"
   },
   "devDependencies": {