feat(dispatch): the Dispatch section, a list with the selected item beside it

[borght-dev]

Part 3 of 8 of Dispatch in BorgDock. The stack, bottom up: #54 → #55 → #56 → #57 → #58 → #59 → #60 → #61.

A new section, second in the rail (keys 1 to 5), that shows the work assigned to you sorted by what it needs.

What changed

• The list groups items by bay, waiting on you first. Each row says why it sits there and shows the slot its agent runs in.
• The detail beside it shows the ADO state, the slot, the pull request with live checks, the agent's question or last message, the next action and the item's place in its workflow.
• You can answer a question, approve a plan, settle a thread, open the thread in T3, move the ADO state or hide a suggestion without leaving the section. Nothing changes in ADO unless you press a button.
• The slot strip shows every T3 project per host: free, yours, busy.
• Keys: J and K move, Enter opens the work item, A takes the first action, M moves the state, O opens the thread in T3.
• When T3 is not paired, or its token expired, a notice offers to pair in place.
• Settings, Agents has the slot pattern.
• New T3 commands: t3_respond, t3_send_message, t3_settle.

Approve plan sends a go-ahead message, with Open in T3 beside it.

How I checked it

Unit tests, and screenshots of the stories RailDispatch, RailDispatchPlan and RailDispatchOutOfSync in both themes.

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