Show open decisions as a deck and route blank documents to Decisions

[MaggieAppleton]

What changes

On desktop, the Decisions tab shows open decisions as a deck, and a blank document sends the Planner's questions there.

• Routing: when a document has no prose and the Planner asks a decision, either in the document or spotted in Chat, the workspace switches to Decisions once per entry and announces "Showing Decisions".
  • It never moves someone who is editing.
  • It never overrides an explicit tab pick.
• Deck: two or more open decisions stack as a deck, with the label "N open decisions".
  • Arrow keys shuffle it. Reduced motion reorders instantly.
  • Cards answered during this visit wait at the back until you leave.
  • Resolved decisions are listed below the deck.
  • Selecting Decisions again resumes at the deck's current top card.
• Phones are unchanged: they keep the list and its save bar.

Screenshots

Desktop Decisions deck

A blank document routed to Decisions

Phone, unchanged list

flowchart LR
  Q[Planner asks a decision] --> B{Document has prose?}
  B -- yes --> D[Stay on Document]
  B -- no --> E{Reader editing or picked a tab?}
  E -- yes --> D
  E -- no --> R[Switch to Decisions once and announce it]
  R --> K{2+ open decisions?}
  K -- yes --> Deck[Deck, arrow keys shuffle]
  K -- no --> Single[Single card]

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Testing

• Unit tests: the routing state machine (hold until answered, the once-per-entry latch, editing declining) and decisionsDeck().
• New e2e tests:
  • harness-decisions-deck.e2e.ts, run with the fake Planner: routing, an editing reader, an explicit tab pick, arrow-key shuffling and resuming at the top card.
  • A phone test confirming the list stays a list.
• Updated e2e tests: older suites now account for the deck and routing.
  • ready() in e2e/room.ts uses main's attached-editor check, which also counts the editor that stays mounted behind Decisions.
  • The read-only viewer assertion in sidebar-decision-counts is kept and checks the hidden editor.
• Checks on the rebased head: bun run types, the unit tests and the design-contract check pass. The initial JS bundle is unchanged at 80306 B gzip.

Slice 4 of the nested-documents work.

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