[jeonghun-jj-lee]

Closes #1764.

Adds Add machine (+) and Refresh (↻) to the FLEET sidebar header, and routes every fleet chat launch through one exactly-once launcher. A per-row focus control was built and then removed for now on review (see below) — the focus subsystem it drove is retained.

What changed

• Shared chat-session launcher (new module + per-panel app-ready state on the chat panel): opens or reveals the chat and delivers a prompt exactly once — immediately when the app is ready, otherwise queued for app-ready with a 15 s deadline and a warning; repeat of the same prompt within 1000 ms suppressed. Sidebar Troubleshoot and the boot-time fleet warning's Troubleshoot now use it, so neither silently no-ops with the chat panel closed.
• Add machine (+): routes on the section's last-posted state — standalone or empty → /create-a-fleet (no fleet exists yet, so start one); populated or unreachable → /add-fleet-device. Unreachable keeps add-fleet-device because a down host can't be known to be empty.
• Refresh (↻): re-arms the change watcher, then re-reads the roster (a client re-fetches only the hub roster); busy clears on the next section update, 10 s backstop with a "didn't complete" tooltip; reduced-motion aware.
• Focus control — removed for now (d98e8870): the per-row target-glyph button and its CSS are gone; on review it didn't earn its place in the UI. The focus subsystem is retained intact — the focus-machine message/handler, FleetFocusStore, applyFocusRequest, focus-follows-tab, the overlay push (the onChange wiring from Fleet Studio wiring — W3: wire the fleet focus selector into the sidebar #1451), and the focused-row marking all stay. Restoring the control is a re-add, not a rebuild.
• Copy + glossary: the section says "machine"; CONTEXT.md gains Machine and Focused machine and a corrected Sidebar entry.

No engine/overlay change. New Project / New Environment launch paths untouched (follow-up in the issue).

Gates (run by the director, not self-reported)

Gate	Base 5738e1e1	This branch d98e8870
Fast suite	317 files · 5218 passed · 0 failed	319 files · 5299 passed · 0 failed · 43 skipped
Typecheck (tsc --noEmit)	exit 0	exit 0
Boot smoke	PASS	PASS

No .only/.skip/.todo added; existing assertions changed only where the issue flips them, plus the two review follow-ups above (empty-fleet routing; focus-control removal and its tests).

Needs a human

• Manual Extension Development Host pass: light + dark themes; Add machine with the chat panel closed; Refresh busy/settle behaviour.
• Review the shape note: two existing tests pin the literal renderSectionHeader("Fleet", "fleet"), so the actions mount via a shared mountSectionActions helper after that call rather than as a third argument.
• Checkpoint commit 3c7c43d5 is red on its own (two pinned tests); fixed in 51ff0ad8. Squash-merge recommended (and it collapses the 6605b800 focus-control add + d98e8870 removal into the shipped state).

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