feat: add submission status filter to browse teams page

- Add has_submission filter option to useTeams hook
- Add Submission Status dropdown filter (All/Submitted/Not Submitted)
- Filter persists in URL query params

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.claude/settings.local.json

@@ -15,7 +15,8 @@
       "Bash(git add:*)",
       "Bash(git commit:*)",
       "Bash(git push)",
-      "Bash(findstr:*)"
+      "Bash(findstr:*)",
+      "Bash(ls:*)"
     ],
     "deny": [],
     "ask": []