sky tab: add Msg column with 10s activity indicator per satellite row

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gui/sky_tab.py

@@ -18,9 +18,11 @@ from PyQt5.QtGui  import QColor, QBrush
 from data_model import ReceiverManager, GNSS_NAMES, GNSS_COLORS
 from sky_widget import SkyPlotWidget
 
-_COL_HEADERS  = ['GNSS', 'SV', 'Elev °', 'Az °', 'C/N₀', 'Fix', 'Receiver']
+_COL_HEADERS  = ['GNSS', 'SV', 'Elev °', 'Az °', 'C/N₀', 'Fix', 'Receiver', 'Msg']
+_COL_MSG      = len(_COL_HEADERS) - 1
 _TRAIL_MAXLEN    = 86400   # 24 hours at 1 Hz
 _TRAIL_MAX_HOURS = 24
+_MSG_HIGHLIGHT_MS = 10_000
 
 
 class SkyTab(QWidget):
@@ -33,6 +35,7 @@ class SkyTab(QWidget):
         self._info_cards:  dict = {}   # rid -> QFrame
         self._info_labels: dict = {}   # rid -> (lbl_pdop, lbl_visible, lbl_used)
         self._trail:       dict = {}   # (rid, gnss_id, sv_id) -> deque[(elev, azim)]
+        self._hi_timers:   dict = {}   # (rid, gnss_id, sv_id) -> QTimer
 
         outer = QVBoxLayout(self)
         outer.setContentsMargins(4, 4, 4, 4)
@@ -87,7 +90,9 @@ class SkyTab(QWidget):
         self._table.setHorizontalHeaderLabels(_COL_HEADERS)
         hdr = self._table.horizontalHeader()
         hdr.setSectionResizeMode(QHeaderView.ResizeToContents)
-        hdr.setStretchLastSection(True)
+        hdr.setSectionResizeMode(_COL_MSG, QHeaderView.Fixed)
+        hdr.setStretchLastSection(False)
+        self._table.setColumnWidth(_COL_MSG, 36)
         self._table.setEditTriggers(QTableWidget.NoEditTriggers)
         self._table.setSelectionBehavior(QTableWidget.SelectRows)
         self._table.setAlternatingRowColors(False)
@@ -193,12 +198,15 @@ class SkyTab(QWidget):
     # ── Data update ───────────────────────────────────────────────────────────
 
     def _on_sat_update(self, rid: str, sats: list):
+        selected = self._selected_rids()
         for sat in sats:
             key = (rid, sat.gnss_id, sat.sv_id)
             self._store[key] = sat
             if key not in self._trail:
                 self._trail[key] = deque(maxlen=_TRAIL_MAXLEN)
             self._trail[key].append((sat.elevation, sat.azimuth))
+            if rid in selected:
+                self._highlight_row(key)
 
         self._sky.update_data(self._visible_sats(), self._active_trails())
         self._update_info()
@@ -219,6 +227,36 @@ class SkyTab(QWidget):
     def _rebuild_table_from_store(self):
         self._rebuild_table(self._visible_sats())
 
+    # ── Row highlight on message receive ─────────────────────────────────────
+
+    def _highlight_row(self, key):
+        try:
+            row = self._table_keys.index(key)
+        except ValueError:
+            return   # row not in table yet (full rebuild pending)
+        item = self._table.item(row, _COL_MSG)
+        if item:
+            item.setText("✓")
+        t = self._hi_timers.get(key)
+        if t:
+            t.start(_MSG_HIGHLIGHT_MS)
+        else:
+            t = QTimer(self)
+            t.setSingleShot(True)
+            t.timeout.connect(lambda k=key, r=row: self._clear_highlight(k, r))
+            t.start(_MSG_HIGHLIGHT_MS)
+            self._hi_timers[key] = t
+
+    def _clear_highlight(self, key, row):
+        self._hi_timers.pop(key, None)
+        if row >= self._table.rowCount() or row >= len(self._table_keys):
+            return
+        if self._table_keys[row] != key:
+            return   # row was reassigned during a full rebuild
+        item = self._table.item(row, _COL_MSG)
+        if item:
+            item.setText("")
+
     # ── Table ─────────────────────────────────────────────────────────────────
 
     def _rebuild_table(self, sats: list):
@@ -260,6 +298,10 @@ class SkyTab(QWidget):
             self._table.setItem(row, 4, cell(f"{sat.cno:.1f}"))
             self._table.setItem(row, 5, cell("✓" if sat.used_in_fix else ""))
             self._table.setItem(row, 6, cell(rid))
+            msg_item = QTableWidgetItem("")
+            msg_item.setTextAlignment(Qt.AlignCenter)
+            msg_item.setBackground(brush)
+            self._table.setItem(row, _COL_MSG, msg_item)
 
         self._table.setSortingEnabled(True)
         vp.setUpdatesEnabled(True)