Fix incorrect dpi_scale import paths

The import path was:
  bmlibrarian.gui.qt.resources.dpi_scale

But should be:
  bmlibrarian.gui.qt.resources.styles.dpi_scale

This would have caused ImportError at runtime.

Author: claude

src/bmlibrarian/lab/paper_reviewer_lab/main_window.py

@@ -15,7 +15,7 @@
 )
 from PySide6.QtCore import Qt
 
-from bmlibrarian.gui.qt.resources.dpi_scale import scaled
+from bmlibrarian.gui.qt.resources.styles.dpi_scale import scaled
 
 from .constants import (
     VERSION,

src/bmlibrarian/lab/paper_reviewer_lab/tabs/input_panel.py

@@ -17,7 +17,7 @@
     QFrame, QSizePolicy,
 )
 
-from bmlibrarian.gui.qt.resources.dpi_scale import scaled
+from bmlibrarian.gui.qt.resources.styles.dpi_scale import scaled
 from bmlibrarian.config import get_models_list, get_model
 
 from ..constants import (

src/bmlibrarian/lab/paper_reviewer_lab/tabs/results_panel.py

@@ -16,7 +16,7 @@
     QScrollArea, QMessageBox, QTabWidget,
 )
 
-from bmlibrarian.gui.qt.resources.dpi_scale import scaled
+from bmlibrarian.gui.qt.resources.styles.dpi_scale import scaled
 from bmlibrarian.agents.paper_reviewer import PaperReviewResult
 
 from ..constants import (

src/bmlibrarian/lab/paper_reviewer_lab/tabs/workflow_panel.py

@@ -13,7 +13,7 @@
     QPushButton, QScrollArea, QProgressBar, QFrame,
 )
 
-from bmlibrarian.gui.qt.resources.dpi_scale import scaled
+from bmlibrarian.gui.qt.resources.styles.dpi_scale import scaled
 
 from ..constants import (
     WORKFLOW_STEPS, STEP_WEIGHTS,

src/bmlibrarian/lab/paper_reviewer_lab/widgets/step_card.py

@@ -13,7 +13,7 @@
     QPushButton, QWidget, QSizePolicy,
 )
 
-from bmlibrarian.gui.qt.resources.dpi_scale import scaled
+from bmlibrarian.gui.qt.resources.styles.dpi_scale import scaled
 
 from ..constants import (
     STATUS_PENDING, STATUS_IN_PROGRESS, STATUS_COMPLETED,