feat: highlight whole mounted row in sample list

The mounted sample used to tint only the frozen "#" cell. Paint the full
row in the same blue so it is findable at a glance, and keep the theme's
own text color on it (the mid-tone blue reads fine without the dark ink
that the pastel status tints need). Repaint the whole row span on
mount/unmount, not just column 0.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/aare/gui/models/user_sample_model.py

@@ -139,17 +139,25 @@ class UserSampleSpreadsheet(QAbstractTableModel):
         elif role == Qt.ItemDataRole.BackgroundRole:
             # Status lives in the "#" column, as a full cell fill under the
             # row number — rows themselves alternate grey/white (view-level)
-            # and selection stays the pale blue tint.
+            # and selection stays the pale blue tint. Exception: the mounted
+            # sample paints the WHOLE row blue so it is findable at a glance.
+            sample = self._sorted_samples[index.row()]
+            if sample.db_id == self.current_sample:
+                return QBrush(qcolor(SAMPLE_ROW_QUEUED_BG))
             if index.column() == COL_STATUS:
-                color = self._status_color(self._sorted_samples[index.row()])
+                color = self._status_color(sample)
                 if color is not None:
                     return QBrush(qcolor(color))
         elif role == Qt.ItemDataRole.ForegroundRole:
-            # Tinted cells get fixed dark ink: the tints stay light pastel in
-            # BOTH themes, so Sunset's white theme text would vanish on them.
+            # Pastel-tinted "#" cells get fixed dark ink: the tints stay light
+            # in BOTH themes, so Sunset's white theme text would vanish on
+            # them. The mounted-row blue is mid-tone and readable with the
+            # theme's own text color, so it keeps the default ink.
+            sample = self._sorted_samples[index.row()]
             if (
                 index.column() == COL_STATUS
-                and self._status_color(self._sorted_samples[index.row()]) is not None
+                and sample.db_id != self.current_sample
+                and self._status_color(sample) is not None
             ):
                 return QBrush(qcolor(SAMPLE_STATUS_TEXT))
         elif role == Qt.ItemDataRole.TextAlignmentRole:  # Align text to center
@@ -220,10 +228,11 @@ class UserSampleSpreadsheet(QAbstractTableModel):
 
     def _emit_tints_changed(self) -> None:
         if self.rowCount() > 0:
+            # Whole span: the mounted row tints every column, not just "#".
             self.dataChanged.emit(
                 self.index(0, COL_STATUS),
-                self.index(self.rowCount() - 1, COL_STATUS),
-                [Qt.ItemDataRole.BackgroundRole],
+                self.index(self.rowCount() - 1, self.columnCount() - 1),
+                [Qt.ItemDataRole.BackgroundRole, Qt.ItemDataRole.ForegroundRole],
             )
 
     def headerData(self, section, orientation, role=None):

tests/unit/gui/test_models.py

@@ -265,6 +265,21 @@ def test_mime_data_round_trips_for_chip_drops(status_model):
     assert samples.s[0].db_id == model.get_id(0).db_id
 
 
+def test_mounted_row_is_blue_across_all_columns(status_model):
+    # Whole-row blue (not just "#") so the mounted sample is findable at a
+    # glance; the blue keeps the theme's own ink (no dark override).
+    model = status_model
+    model.updateCurrentSample(current_puck="P1", current_sample=1)
+    row = _row_of(model, 1)
+    for col in range(model.columnCount()):
+        brush = model.data(model.index(row, col), Qt.ItemDataRole.BackgroundRole)
+        assert brush.color().name().lower() == "#729fcf"
+        assert model.data(model.index(row, col), Qt.ItemDataRole.ForegroundRole) is None
+    # Other rows: still "#"-only tint, other columns untouched.
+    other = _row_of(model, 2)
+    assert model.data(model.index(other, 1), Qt.ItemDataRole.BackgroundRole) is None
+
+
 def test_spreadsheet_param_columns(status_model):
     from aarecommon.models.models import DataCollectionParameters