feat: add workspace home collaboration and reasoning selectors

[Dimillian]

Motivation

• Allow selecting model reasoning effort and collaboration mode when launching runs from the workspace home, matching the composer controls and enabling Plan/Code presets.
• Reuse existing composer UI affordances so the workspace home provides the same options users expect when starting runs.

Description

• Added collaboration mode and reasoning effort props to the WorkspaceHome component and rendered composer-style selectors next to the run mode and model controls using formatCollaborationModeLabel for labels.
• Extended the useWorkspaceHome hook signature to accept effort and collaborationMode and threaded those values into run launches so sendUserMessageToThread includes effort and collaborationMode in its options.
• Updated App.tsx to pass resolvedEffort and collaborationModePayload into useWorkspaceHome, and to forward collaboration/reasoning selection handlers and values into WorkspaceHome.
• Adjusted types for the sendUserMessageToThread options and added small UI wiring to match the composer behaviour.

Testing

• Ran npm run lint (ESLint) and it completed successfully.
• Ran npm run typecheck (tsc --noEmit) and it completed successfully.

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Codex Task

[Dimillian]

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[chatgpt-codex-connector]

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