fix: 终极状态回滚 + 三个 panel 短路径导包修复

- water_quality_gui_v2.py：回滚机制由 panel_registry.get_tab_index 改为基于 PANEL_REGISTRY[current_tab_idx]['step_id'] 的索引反查，消除不存在的 get_tab_index 导致回滚期间二次崩溃并被静默吞噬的幽灵跳步根因

src/gui/panels/step11_map_panel.py

@@ -14,7 +14,7 @@ from typing import List, Optional
 _HERE = os.path.dirname(os.path.abspath(__file__))
 if _HERE not in sys.path:
     sys.path.insert(0, _HERE)
-from _step_path_resolver import resolve_subdir, get_step_output_path
+from src.gui.panels._step_path_resolver import resolve_subdir, get_step_output_path
 
 from PyQt5.QtCore import Qt, QThread, pyqtSignal
 from PyQt5.QtWidgets import (

src/gui/panels/step6_feature_panel.py

@@ -12,7 +12,7 @@ from pathlib import Path
 _HERE = os.path.dirname(os.path.abspath(__file__))
 if _HERE not in sys.path:
     sys.path.insert(0, _HERE)
-from _step_path_resolver import resolve_subdir
+from src.gui.panels._step_path_resolver import resolve_subdir
 
 from PyQt5.QtWidgets import (
     QWidget, QVBoxLayout, QGroupBox, QFormLayout, QLabel,

src/gui/panels/step8_ml_train_panel.py

@@ -12,7 +12,7 @@ from pathlib import Path
 _HERE = os.path.dirname(os.path.abspath(__file__))
 if _HERE not in sys.path:
     sys.path.insert(0, _HERE)
-from _step_path_resolver import get_step_output_path, resolve_step_widget, resolve_subdir
+from src.gui.panels._step_path_resolver import get_step_output_path, resolve_step_widget, resolve_subdir
 
 from PyQt5.QtWidgets import (
     QWidget, QVBoxLayout, QGroupBox, QFormLayout, QGridLayout,