fix: remove obsolete commit checkpoints file; update WebRTCPlayer for error handling; improve stream fallback logic in StreamPage

.gitignore

@@ -1,3 +1,32 @@
+# core
+.DS_Store
+.env
+.env*.local
+.env.production
+output
+dist
+target
+.idea
+.cache
+.output
+node_modules
+package-lock.json
+yarn.lock
+.vercel
+*.db
+.repo_ignore
+i.*
+i-*
+i/
+internal/
+past.*
+past-*
+past/
+*.log
+private
+.blade
+.npm-cache
+
 # Logs
 logs
 *.log
@@ -44,3 +73,4 @@ test_scripts/
 
 # Rust
 target/
+.ai/