Add project reports section and fix mobile overflow issues

- Add project-wide reporting table with scope selector (all rounds / per round)
- Fix horizontal overflow on mobile (body, admin sidebar, logo truncation)
- Make members header and reports tabs responsive with flex-wrap

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/globals.css

@@ -217,7 +217,7 @@
   }
 
   body {
-    @apply bg-background text-foreground;
+    @apply bg-background text-foreground overflow-x-hidden;
     font-feature-settings: "rlig" 1, "calt" 1;
   }