fix: Reduce unnecessary IPC calls causing UI unresponsiveness

[charlesvien]

Problem

Excessive IPC calls during boot and redundant re-renders cause the app to become unresponsive.

Closes #1348

Changes

1. Add opt-in IPC timing middleware to log call durations during first 15s of boot
2. Fix markAsViewed re-firing on every render by stabilizing the dependency to a string key instead of a new array reference
3. Dedupe recordActivity mutation calls per task run using a module-level Set

How did you test this?

Manually

[charlesvien]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix: Fix stale context usage after compaction + usage calculation #1548
• fix: Show both local and remote repo name when they differ #1547
• fix: Queue messages during conversation compaction #1546
• fix: Prevent permission request from stealing focus across cells #1545
• feat: Add double-click to rename task title in session header #1544
• fix: Reduce unnecessary IPC calls causing UI unresponsiveness #1542 👈 (View in Graphite)
• fix: Move folder cleanup and orphaned worktree pruning to main process #1541
• fix: Show "edit" instead of "create" in permission prompt for existing files #1538
• fix: Remove double scrollbar from repo selector #1537
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.