🎨 Palette: Add truncation indicator to MissionControl

[google-labs-jules]

💡 What: Added visual truncation to MissionControl task list, limiting the initial display to 8 tasks and summarizing the remainder (e.g. "... and X more tasks").
🎯 Why: When dynamic lists exceed terminal height constraints, they can become unreadable and hurt user situational awareness. Adding a visual indicator aligns with project UX standards detailed in our journals.
📸 Before/After: Visual UI change (no screenshots applicable in pure terminal headless mode without rendering).
♿ Accessibility: Enhances situational awareness for users by explicitly calling out hidden state.

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PR created automatically by Jules for task 577682041141975027 started by @YoungSx

[google-labs-jules]

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