feat: release 2.4

[ce5rpy]

Summary

• OpenBridge page shows keepalive connected status (flag, online/offline dot) from server dashboard_state.
• Stream chip debounce raised to 0.5s on the OpenBridge view.

[github-actions]

Release PR — merge method

Commits listed on this PR: 2 (file diff may be smaller — that is normal when squash releases stacked up).

Required

Merge with Create a merge commit. Do not use Squash and merge.

Why

• Squash on master creates new commit SHAs; develop keeps the original squash commits from feature PRs.
• The next release PR then lists old fixes again even though master already has them.
• Merge commit keeps the same SHAs on both branches; CI fast-forwards develop to master after chore(release) — no force-push, local git pull on develop still works.

One-time cleanup

If this PR lists commits from earlier releases (2.0.4, 2.0.5, …), merge once with merge commit; post-release sync realigns develop with master automatically.