fix(security): enforce Content-Security-Policy instead of report-only

Mozilla Observatory docked 25 points for CSP being report-only. The
report-only period since 2026-08-12 came back clean in GlitchTip except
6 isolated script-src eval hits on 2026-08-15 (likely react-easy-crop
on the avatar-crop flow) that never recurred. Keep 'unsafe-eval' in
script-src defensively so an enforced policy can't repeat the earlier
incident where a blocked required resource crashed ClerkProvider
app-wide.

src/proxy.ts

@@ -119,17 +119,27 @@ export default clerkMiddleware(
     }
   },
   {
-    // Report-Only for now — an earlier enforced attempt blanked the whole
-    // app because ClerkProvider crashes uncaught when a required resource
-    // gets blocked mid-init. Clerk's own contentSecurityPolicy option (not
-    // the hand-rolled next.config.ts draft this replaces) already ships the
-    // 'unsafe-inline'/https: script-src Next.js needs to hydrate, which is
-    // what the hand-rolled version was missing. Move to enforced only after
-    // a clean report-only period — see /api/csp-report for the violations.
+    // Enforced as of 2026-08-22 (Mozilla Observatory docked 25 points for
+    // Report-Only-only). The report-only period (since 2026-08-12/13) came
+    // back clean: GlitchTip shows zero CSP violations since 2026-08-16
+    // (verified via issue_events_issueaggregate on the self-hosted instance)
+    // except 6 script-src "eval" hits on 2026-08-15 from /pets/[petId] and
+    // /onboarding/pet — both routes use react-easy-crop for avatar cropping,
+    // the likely source, and it hasn't recurred since. Clerk's production
+    // script-src default omits 'unsafe-eval' (see
+    // node_modules/@clerk/nextjs/.../content-security-policy.js), so an
+    // enforced policy would hard-block that call if it ever recurs. Adding
+    // 'unsafe-eval' back here defensively avoids repeating the earlier
+    // incident where an enforced CSP blanked the whole app (ClerkProvider
+    // crashed uncaught on a blocked required resource) — it costs nothing
+    // extra in Mozilla's scoring since 'unsafe-inline'/https:/http: are
+    // already unconditionally in Clerk's default script-src. Revisit once
+    // the eval source is confirmed fixed and remove this line.
     contentSecurityPolicy: {
-      reportOnly: true,
+      reportOnly: false,
       reportTo: "/api/csp-report",
       directives: {
+        "script-src": ["unsafe-eval"],
         "img-src": [`https://${getSupabaseHostname()}`, "https://image.mux.com", "blob:"],
         "connect-src": [
           `https://${getSupabaseHostname()}`,