Add task sidebar auto-open setting

[justsomelegs]

What Changed

Adds a new persisted client setting, autoOpenPlanSidebar, which controls whether the task sidebar opens automatically when plan/task steps appear.

The change wires that setting through:

• the shared client settings schema/defaults
• the General settings panel in the web app
• ChatView auto-open behavior for plan steps, implement mode, and new-thread navigation
• desktop/local persistence tests

Default behavior is unchanged: auto-open remains enabled unless the user turns it off.

Why

Right now the task sidebar can reopen itself after the user has dismissed it, which makes the UI feel noisy and harder to control during plan/implementation flows.

This keeps the existing default for users who like the current behavior, while giving users a predictable opt-out. The implementation is small and localized, and it gates all of the existing auto-open paths behind one shared setting instead of adding one-off exceptions.

UI Changes

Adds a new toggle in Settings:

• Task sidebar
• Description: Open the plan and task sidebar automatically when steps appear.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add auto-open setting for the task sidebar

• Adds autoOpenPlanSidebar boolean to ClientSettingsSchema (default true) and ClientSettingsPatch, allowing users to control whether the task/plan sidebar opens automatically.
• Exposes a 'Task sidebar' toggle in the General settings panel with per-setting reset support.
• Gates all auto-open behavior in ChatView — on new plan steps, on message send, and on new implementation thread navigation — behind this setting.
• Behavioral Change: users who disable this setting will no longer see the task sidebar open automatically in any of those contexts.

^{Macroscope summarized 3f99895.}

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[macroscopeapp]

Approvability

Verdict: Approved

Adds a simple boolean setting to control auto-opening the task sidebar, with the default preserving existing behavior. Changes are self-contained, follow existing patterns, and have no security or breaking implications.

^{You can customize Macroscope's approvability policy. Learn more.}