refactor(frontend) : make page headers and filters sticky across all pages

Wrap title + filters in a sticky container (top-8 sm:top-12, z-20, bg-white)
on all pages for consistent scroll behavior. Also fix SidebarTimer icon
visibility when sidebar is collapsed.

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

src/Service/GiteaApiService.php

@@ -13,6 +13,7 @@ use Symfony\Component\String\Slugger\AsciiSlugger;
 use Symfony\Component\String\Slugger\SluggerInterface;
 use Symfony\Contracts\HttpClient\Exception\ExceptionInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
+use Throwable;
 
 final readonly class GiteaApiService
 {
@@ -203,7 +204,11 @@ final readonly class GiteaApiService
             throw new GiteaApiException('Gitea token is not set.');
         }
 
-        return $this->tokenEncryptor->decrypt($encrypted);
+        try {
+            return $this->tokenEncryptor->decrypt($encrypted);
+        } catch (Throwable $e) {
+            throw new GiteaApiException('Failed to decrypt Gitea token: '.$e->getMessage(), 0, $e);
+        }
     }
 
     private function assertProjectHasRepo(Project $project): void