Refactor bim/module/drawing/gizmos — framework + icon infra

Three concerns bundled into one cohesive refactor of gizmos.py
(splitting them surgically requires intermediate commits with
duplicate same-named classes that Python can't parse):

1. Framework primitives — StaticTrisGizmoMixin + TexturedQuadGizmoMixin
   replace the older TrisGizmoMixin. New module-level helpers:
   _get_static_tris_shader / _get_static_tris_batch / clear_static_
   tris_cache for cached GPU batch reuse, _draw_outline_and_body for
   the shared outline-then-body render path, draw_tris_with_outline
   as the public wrapper. billboarded_at(world_pos, billboard_rot,
   scale) is the canonical billboard-matrix helper; should_flip_extend_
   arrow encapsulates the view-aware mirror decision for extend
   gizmos; get_warning_color_from_prefs reads the user's warning
   color.

2. Config classes — BaseValueGizmoConfig (shared visibility + dimension-
   text contract), CountGizmoConfig (array N indicator),
   DimensionGizmoConfig (length / height / depth labels), IconActionConfig
   (icon-only gizmos that invoke an operator on click). DimensionRenderer
   draws the actual numeric label using BLF.

3. Icon classes — each rewritten on StaticTrisGizmoMixin so they share
   the cached GPU batch + outline-then-body render path:
   GizmoLockOpen / GizmoLockClosed (replacing the single-state
   GizmoLock), GizmoArc, GizmoFillet, GizmoWallCornerIcon,
   GizmoWallTeeIcon, GizmoPen / GizmoValidate / GizmoCancel (the
   parametric-edit triad), GizmoPlus / GizmoMinus / GizmoTrash,
   GizmoArrayParent / GizmoArrayAll / GizmoArrayLayerIndicator (array
   context indicators with a small digit-rendering helper for the "xN"
   count label), GizmoMerge / GizmoSplit / GizmoUnjoin (wall-join
   icons), and GizmoMenu (textured-quad icon-action menu trigger).

The legacy TrisGizmoMixin, GizmoLock, and DimensionDrawConfig are
removed; downstream callers in subsequent PR4 commits swap to the
new mixin and config classes when their feature operators land.

CycleTypeMixin / PickTypeMixin / TypeAccessorBase live in
bim.parametric_lifecycle (previous commit). The three mixins are
re-exported from gizmos.py here so feature-module access via
``gizmo.<MixinName>`` keeps working until PR5 cleanup drops the
re-exports.

bim/module/drawing/__init__.py is updated in the same commit to
register the 11 new gizmo classes (GizmoLockOpen / GizmoLockClosed /
GizmoFillet / GizmoWallCornerIcon / GizmoWallTeeIcon / GizmoTrash /
GizmoArrayParent / GizmoArrayAll / GizmoArrayLayerIndicator /
GizmoUnjoin / GizmoMenu) — without that, the new classes exist in
gizmos.py but aren't usable as bpy gizmo types.

Generated with the assistance of an AI coding tool.

src/bonsai/bonsai/bim/module/drawing/__init__.py

@@ -138,15 +138,24 @@ classes = (
     gizmos.GizmoArrow2D,
     gizmos.GizmoCone,
     gizmos.GizmoDimension,
-    gizmos.GizmoLock,
+    gizmos.GizmoLockOpen,
+    gizmos.GizmoLockClosed,
     gizmos.GizmoArc,
+    gizmos.GizmoFillet,
+    gizmos.GizmoWallCornerIcon,
+    gizmos.GizmoWallTeeIcon,
     gizmos.GizmoPen,
     gizmos.GizmoValidate,
     gizmos.GizmoCancel,
     gizmos.GizmoPlus,
     gizmos.GizmoMinus,
+    gizmos.GizmoTrash,
+    gizmos.GizmoArrayParent,
+    gizmos.GizmoArrayAll,
+    gizmos.GizmoArrayLayerIndicator,
     gizmos.GizmoMerge,
     gizmos.GizmoSplit,
+    gizmos.GizmoUnjoin,
     gizmos.GizmoExtend,
     gizmos.GizmoExtendVertical,
     gizmos.GizmoOffsetExterior,
@@ -154,6 +163,7 @@ classes = (
     gizmos.GizmoOffsetInterior,
     gizmos.GizmoAddOpening,
     gizmos.GizmoCycle,
+    gizmos.GizmoMenu,
     # Drawing-specific gizmos
     gizmos.UglyDotGizmo,
     gizmos.ExtrusionGuidesGizmo,