fix(sdk): watch-mode chat subscriptions survive quiet windows

.changeset/chat-stream-supersede-race.md

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+---
+"@trigger.dev/sdk": patch
+---
+
+Fixed a race where quickly restarting a chat stream could break stop and reconnect for the new stream. Stopping a chat now also hands it back to your other tabs instead of leaving them read-only.

.changeset/watch-mode-keepalive.md

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+---
+"@trigger.dev/sdk": patch
+---
+
+Watch-mode chat streams now survive quiet windows and keep delivering later turns, and a reply cut off by a lost connection now shows an error instead of appearing finished.