fix: Stop renderer from overriding plan approval permission mode

[charlesvien]

Problem

Selecting "Yes, auto-accept all permissions" on plan approval enters default mode instead of bypass because the renderer overwrites the agent's mode setting.

Closes #1502

Changes

1. Skip generic "acceptEdits" override in handlePermissionSelect for switch_mode permissions (plan approval manages its own mode via the agent)
2. Cleanup useEffect that reverted bypass mode whenever allowBypassPermissions was false.

How did you test this?

Manually

[charlesvien]

• fix: Stop renderer from overriding plan approval permission mode #1523 👈 (View in Graphite)
• main

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