style: move Unmeasured next to All, 1px gap between filter chips

Unmeasured and All are both 'what is left' views; the hand-applied
labels (Queued/Flagged/Measured) follow. The 1px spacing keeps the
chips readable as separate buttons instead of one solid bar.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/aare/gui/panels/tell_sample_panel.py

@@ -150,15 +150,18 @@ class TellSamplePanel(QFrame):
         # Left margin 0: "All" shares the table's left edge; bottom 0: the
         # row sits directly on the table.
         chip_row.setContentsMargins(0, 2, 6, 0)
-        chip_row.setSpacing(0)
+        # 1px gap so the chips read as separate buttons, not one solid bar.
+        chip_row.setSpacing(1)
         self.status_chips = QButtonGroup(self)
         self.status_chips.setExclusive(True)
         for label, key in (
             ("All", None),
+            # Unmeasured next to All: both are "what is left" views, the
+            # remaining chips are hand-applied labels.
+            ("Unmeasured", "unmeasured"),
             ("Queued", "queued"),
             ("Flagged", "flagged"),
             ("Measured", "measured"),
-            ("Unmeasured", "unmeasured"),
         ):
             if key == "queued":
                 chip = QueueDropChip(label, self)