fix(chat): Chat view fixes — select and copy message text, keep the view across project switches

[danny-acv2]

Two small fixes to the ⌘M chat view, one commit each.

1. Message text could not be selected or copied

What broke

In the ⌘M chat view, dragging over a message highlighted nothing, so Cmd/Ctrl+C had nothing to copy. The CSS was fine — .term-chat__msgs already has user-select: text.

Why

With the composer focused, a press on the message list moves focus out of the composer (the list is not focusable). useClickToFocus reads that as a press on the node's own chrome — focusLossOutcome → 'reclaim' — and focuses the composer again one tick later. Focusing a textarea moves the document selection into it, so the drag-selection that press just started is cancelled.

Fix

• focusLossOutcome gets a pressedInReadableText input and a new outcome, 'reclaim-on-release', for a press that landed on .term-chat__msgs.
• The hook remembers the element that lost focus and decides on pointerup through the pure reclaimOnRelease:
  • plain click (nothing selected): the keyboard goes back to the composer, exactly as before;
  • a selection was made: it is left alone, and so is the keyboard, so Cmd/Ctrl+C copies it. Clicking the composer afterwards works as usual.
• Every other focusLossOutcome case is unchanged. The header-drag reclaim is still immediate.
• The click-to-focus paragraph in CLAUDE.md now describes this case.

2. The ⌘M view closed itself on a project switch

What broke

Open the chat view on a node, switch to another project and come back: the node is on the raw terminal again. A page reload does the same.

Why

mdMode lived only in React Flow's node data. It was in neither the load seam nor the save seam of state/workspace.ts (nodeStatesToFlow / flowToNodeStates), and a project switch rebuilds the canvas from the saved nodes.

Fix

• Persist it as CanvasNodeState.mdMode, next to hideFanout, through both seams.
• It is written only while the view is open, so a node that never opened it saves byte-for-byte as before.
• Nothing in src/core filters node fields, so no core change is needed.
• CardModal's view stays modal-local, as its comment intends.
• The ⌘M bullet in CLAUDE.md notes that the view is persisted.

Tests

• Focus (terminalFocusMode.test.ts, useClickToFocus.test.tsx): 46 pass, 5 of them new.
  • A pure case for 'reclaim-on-release' and its boundaries, plus reclaimOnRelease.
  • Three jsdom cases on a chat-shaped node: no reclaim while the press is still selecting; a press that selected text keeps the selection; a plain click hands the keyboard back to the composer on pointerup.
  • With the fix reverted ('reclaim' for every press on the node), 3 of the 5 fail, including both DOM selection cases.
• Persistence (workspace.md-mode.test.ts, new): an open view survives a save/load round trip, and a closed one is not written. Removing the save line turns it red.
• Typecheck: npm run typecheck is clean for both web and node.
• Broader run: src/renderer/state/, useMdModeFocus and the focus suites give 1103/1104. The one failure is workspace.node-ids.test.ts › never repeats across a simulated module reload. It is timing-sensitive: it also fails on untouched main when the machine is loaded, and passes on this branch when run alone.
• Field use: both fixes have been running for a day on a Server Edition install, where the selection fix was confirmed in the browser.

Three surfaces

• Desktop and Server Edition: both changes are renderer-only and behave the same on both.
• Mobile companion: not applicable. The phone has no ⌘M view and does not read mdMode.

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