[Fix] Terminal views flood browser error telemetry

[roomote-roomote]

​Opened on behalf of @daniel-lxs. Follow up by mentioning @roomote-roomote, in the web UI, or in Slack.

What changed

• Defer xterm fitting outside ResizeObserver callbacks and coalesce repeated resize notifications into one animation frame.
• Remove the duplicate initial terminal fit that amplified layout feedback.
• Enable PostHog client exception capture so replay errors also reach Error Tracking.
• Cover resize deferral/coalescing and the analytics exception-capture contract with focused client tests.

Why this change was made

A task replay produced an extreme browser error volume while terminal and log views were active. The terminal synchronously changed observed layout from its resize callback, matching a ResizeObserver feedback loop, while exception capture was not enabled for the PostHog client and left Error Tracking without the corresponding diagnostic events.

Impact

Terminal task sessions no longer repeatedly refit during the same resize notification cycle, reducing browser error and replay noise. Future uncaught client failures are also available in PostHog Error Tracking for diagnosis.

[roomote-community]

No code issues found. See task

_{Reviewed bf15f53}