ux: start the analysis server from inside the TUI (no more dead window)

The remaining "long wait with no feedback" was the launcher's _ensure_server: it
started the supervisor and blocked ~10s polling for the port BEFORE the TUI (and
its overlay) existed. Only a one-line stderr message covered it.

Move that wait behind the overlay. The launcher now only does instant checks
(sweep stale locks if the server is down, honor --no-server) and hands the binary
straight to the TUI with ensure_server=True. The TUI's _connect starts the
server itself and narrates it in the loading overlay ("starting analysis
server… (Ns)") before opening/analyzing the binary. idb_open is idempotent, so an
already-open session is still adopted instantly (the launcher no longer needs to
probe sessions).

_ensure_server gained a progress callback so it reports to the overlay instead of
stderr (which would corrupt the TUI screen).

Verified with the server DOWN: chrome + overlay appear within ~0.5s, notes go
"starting analysis server… (0s)" -> "opening echo — analyzing…" ->
"echo — 128 functions…" -> land on main. Pilot suite (db/ensure_server=False path)
green: startup/palette/view_toggle/disasm_nav/search/rename/follow_xrefs/
decomp_nav/mouse/listing_view/continuous_view/func_banners.

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