projects: switch between a project's binaries in the TUI (phase 1c)

Wires the project model + worker pool into the app. Project mode is ADDITIVE —
without --project the app is exactly the single-binary tool it was, which is what
keeps the 167-check pilot meaningful.

* IdaTui(project=...) builds a WorkerPool and opens the project's first binary;
  _open_worker_client asks the pool instead of spawning directly.
* BinaryState snapshots what a switch leaves behind (program, func_index, nav,
  cur, view prefs, filter). Switching reuses the _after_reconnect shape: swap
  client+program, rebuild the index, reopen the entry. A still-resident binary
  restores instantly (Program + index are in memory); an evicted one gets a fresh
  worker but keeps its nav history, which is just addresses.
* ProjectPalette (Ctrl+O, + a "Switch binary…" palette command): the project's
  binaries with resident/analysed/pinned/active state and memory, filterable.
* launch.py --project FILE, creating the project when binaries are also given;
  stages everything up front so the source tree is never written to.

Two bugs found while testing:
* _did_auto_land is app-wide, but landing is per-binary: after the first binary
  landed, a cold switch never landed at all AND left the switch overlay up
  forever. Reset it per switch.
* PRE-EXISTING: the status Static had Textual markup enabled, so a single-word
  bracket marker parses as a style tag and is silently eaten — [listing] and
  [pseudocode] have never actually rendered (only [split · listing] survived,
  because the · makes it an invalid tag). Status is plain text with brackets and
  symbol names, so markup=False.

tests/test_project_ui.py: end-to-end pilot on two real binaries (18 checks) —
boot, switcher contents, switch, per-binary index, both workers resident,
switch back with state intact, return-to-where-you-were, and the promise that
the source tree stays pristine while every artifact lands in the sidecar.
Full single-binary suite unchanged at 167/2 (the standing flakes).

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