test(palette): use deterministic close in 3 test functions

3 tests fail because _toggle_command_palette is non-deterministic AND the
tests depend on prior fixture state. The toggle only flips the boolean,
so the test's behavior depends on whether palette starts open or closed.

Fixed all 3 tests by adding a force-close preamble that:
  if client.get_value("show_command_palette") is True:
      client.push_event("custom_callback", {"callback": "_toggle_command_palette", "args": []})
      poll for False with 2s deadline

Tests fixed:
- test_palette_starts_hidden: replaced unconditional toggle (which opened
  the palette from default-closed state) with conditional force-close
- test_palette_toggles_via_callback: added force-close preamble before
  the "assert initial state is False" check
- test_palette_query_state_resets_on_open: added force-close preamble
  before the 3-toggle sequence (so toggle sequence starts from closed
  state and ends open, matching the assertion)

Verification: 7 of 7 tests pass in tests/test_command_palette_sim.py
(was 3 failed, 4 passed). Also passes in batch with other live_gui
tests (12 of 12 pass) - no isolation-pass fallacy.

tests/test_command_palette_sim.py

@@ -24,15 +24,16 @@ def test_palette_starts_hidden(live_gui: Any) -> None:
  # palette IS closable via the callback, not that it happens to be
  # closed at this moment. Resetting here makes the assertion meaningful
  # without depending on test ordering.
- client.push_event("custom_callback", {
-  "callback": "_toggle_command_palette",
-  "args": [],
- })
- deadline = time.time() + 2.0
- while time.time() < deadline:
-  if client.get_value("show_command_palette") is False:
-   break
-  time.sleep(0.05)
+ # Two toggles from default-closed state = closed. Two toggles from
+ # open state = open. So we MUST check state and toggle only if open.
+ if client.get_value("show_command_palette") is True:
+  client.push_event("custom_callback", {
+   "callback": "_toggle_command_palette",
+   "args": [],
+  })
+  deadline = time.time() + 2.0
+  while client.get_value("show_command_palette") is not False and time.time() < deadline:
+   time.sleep(0.05)
  state = client.get_value("show_command_palette")
  assert state is not None, "show_command_palette should be a gettable field"
  assert state is False, f"Palette should be closable, got {state}"
@@ -41,6 +42,14 @@ def test_palette_starts_hidden(live_gui: Any) -> None:
 def test_palette_toggles_via_callback(live_gui: Any) -> None:
  """The _toggle_command_palette callback should open and close the palette."""
  client = ApiHookClient()
+ # Force-close palette first (live_gui is session-scoped; prior tests may leave it open).
+ # Two toggles from default-closed state = closed. Two toggles from open state = open.
+ # So we MUST check state and toggle only if open. Then poll to verify closure.
+ if client.get_value("show_command_palette") is True:
+  client.push_event("custom_callback", {"callback": "_toggle_command_palette", "args": []})
+  deadline = time.time() + 2.0
+  while client.get_value("show_command_palette") is not False and time.time() < deadline:
+   time.sleep(0.05)
  assert client.get_value("show_command_palette") is False
 
  # Open via custom callback
@@ -86,6 +95,14 @@ def test_palette_query_state_resets_on_open(live_gui: Any) -> None:
  This ensures a fresh state every time the user opens the palette.
  """
  client = ApiHookClient()
+ # Force-close palette first (live_gui is session-scoped; prior tests may leave it open).
+ # Two toggles from default-closed state = closed. Two toggles from open state = open.
+ # So we MUST check state and toggle only if open. Then poll to verify closure.
+ if client.get_value("show_command_palette") is True:
+  client.push_event("custom_callback", {"callback": "_toggle_command_palette", "args": []})
+  deadline = time.time() + 2.0
+  while client.get_value("show_command_palette") is not False and time.time() < deadline:
+   time.sleep(0.05)
 
  # Open once, set some state (simulate user typing)
  client.push_event("custom_callback", {