fix(client): address PR #36 re-review — 7 items from Hoshe + Tyre

Warnings: facing indicator tests use Godot-normalized rotation range
(-PI, PI] instead of raw addition (SW/W/NW in test_rendering,
West in test_client_p3). Suggestions: cache font in world_radial
_draw(), fix docstring on deactivate_insert() trigger, document
tile-coordinate system on _eval_player_near (D-066), add public
reset_facing_state() to InputMapper (D-030 testability).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/scripts/autoloads/input_mapper.gd

@@ -120,6 +120,13 @@ func flush_queue() -> Array[Dictionary]:
 	return queue
 
 
+## Reset facing state to default (North). Use in tests per D-030 testability.
+func reset_facing_state() -> void:
+	facing_angle = -PI / 2.0
+	facing_octant = "North"
+	_last_sent_octant = "North"
+
+
 # D-054: Compute facing angle from mouse position relative to player screen position.
 # Uses viewport canvas transform to convert world coords to screen coords.
 # Intentional coupling: reads GameState.player_position directly — InputMapper is an