chore(webapp,core,sdk): upgrade @s2-dev/streamstore to 0.25 and migrate S2 hosts (#4349)

.changeset/chat-agent-preload-oom-recovery.md

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+---
+"@trigger.dev/sdk": patch
+---
+
+Fix a preloaded `chat.agent` run dropping an in-flight message when it retries after an out-of-memory error. The message being processed when the run hit the OOM is now recovered and re-run on the retry, instead of being skipped while the run waited for a new message.

.changeset/chat-handover-cursor-off-by-one.md

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+---
+"@trigger.dev/core": patch
+---
+
+Fix a chunk occasionally dropped when a chat.agent run takes over from the warm first turn. The realtime stream writer now reports the inclusive last-written position as the resume cursor, so the agent's first record after the handover is no longer skipped.

.changeset/chat-session-caught-up-resume.md

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+---
+"@trigger.dev/core": patch
+"@trigger.dev/sdk": patch
+"trigger.dev": patch
+---
+
+`AgentChat.reconnect()` now settles promptly when reconnecting to an idle chat instead of holding the connection open for the full long-poll window. Also upgrades the S2 streamstore client to 0.25 and moves realtime streams to S2's current hosts.