feat(telegram): push notifications for answers + dedupe tool log

[arniesaha]

Summary

• Split status bubble (edit-only) from answer bubble (new message → push fires)
• Collapse consecutive duplicate tool entries as `✅ (×N)`
• Finalize status bubble to just the tool log at end of turn (or `✅ Done`)

Behavior change

Before: bot edits the "⏳ Thinking..." message in place with the final answer — if the user left the app, no push notification.
After: "⏳ Thinking..." stays as a live status/tool-log bubble; the actual answer is sent as a new message when the model starts producing text, which triggers a Telegram push notification.

Test plan

• `npx tsc --noEmit` clean
• Send a message, leave app, confirm push notification arrives for answer
• Run a browser_control loop, confirm tool log shows `✅ Controlling browser (×N)` not N lines
• Tool-only turn (no text response) still sends answer as new message
• Error path still works

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