Git Repository link always shows, defaulting to the canonical upstream repo

Previously hidden entirely when NEXT_PUBLIC_GIT_REPO_URL was unset, which
meant it never appeared on localhost or on anyone else's clone that hadn't
explicitly configured it. It should always point somewhere - the canonical
repo (git.ciagent.org) is the sensible default everywhere, overridable only
by a deployment that runs its own separate git server.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

docker-compose.yml

@@ -97,8 +97,9 @@ services:
       # (not the container) can reach, so a LAN client needs this set to
       # the host machine's LAN IP, not localhost. See .env.example.
       NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-http://localhost:8000}
-      # "Git Repository" landing-page link - blank by default so it's
-      # hidden unless you actually run a git server for this deployment.
+      # "Git Repository" landing-page link - blank here so the frontend
+      # falls back to its own hardcoded default (the canonical upstream
+      # repo). Only set this to point the button at a different git server.
       NEXT_PUBLIC_GIT_REPO_URL: ${NEXT_PUBLIC_GIT_REPO_URL:-}
     ports:
       - "3000:3000"