chore(gdb): add obj state/scroll/layout fields to snapshot

- Add gen_obj_state_consts.py generator for lv_state_t
- Fix parse_bitmask_enum to support parens-optional shift expressions
- Add state, scroll, ext_click_pad, ext_draw_size, scrollbar_mode,
  scroll_snap, scroll_dir, layer_type, name, user_data, layout_inv,
  w/h_layout, is_deleting, rendered, skip_trans to LVObject.snapshot()
- Update dashboard frontend with full detail panel rendering

scripts/gdb/lvglgdb/__init__.py

@@ -46,6 +46,8 @@ from .lvgl import (
     LVObjClass,
     OBJ_FLAG_NAMES,
     decode_obj_flags,
+    OBJ_STATE_NAMES,
+    decode_obj_states,
     LVSubject,
     LVObserver,
     SUBJECT_TYPE_NAMES,
@@ -99,6 +101,8 @@ __all__ = [
     "LVObjClass",
     "OBJ_FLAG_NAMES",
     "decode_obj_flags",
+    "OBJ_STATE_NAMES",
+    "decode_obj_states",
     "LVSubject",
     "LVObserver",
     "SUBJECT_TYPE_NAMES",