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

src/pages/index.astro

@@ -3,13 +3,16 @@ import Base from '../layouts/Base.astro';
 import StudioApp from '../components/StudioApp.tsx';
 import { query } from '../lib/db';
 import { has } from '../lib/modules';
+import { tFor, dictFor } from '../lib/i18n.server';
 
 // Without the AI module there is no studio, and the print studio is the product.
 if (!has('ai')) return Astro.redirect('/print', 302);
 
 const locale = Astro.locals.locale ?? 'en';
+const t = tFor(locale);
+const dict = dictFor(locale);
 const recipes = await query('SELECT * FROM recipes ORDER BY is_default DESC, name').catch(() => []);
 ---
-<Base title="Studio · Klarbild">
+<Base title={t('Studio · Klarbild')}>
   <StudioApp client:load recipes={recipes} locale={locale} dict={dict} />
 </Base>