Serial monitor redesign: Test box button, InfluxDB row in the checklist

- Test box: restart + start-up capture + online InfluxDB check (data newer
  than the restart), with a status strip; checklist and findings are the
  main view, live log / guided troubleshooting / box details are tabs,
  rarely used actions in a More menu
- light palette on all systems (macOS dark mode made the colours unreadable)
- new rule influx.invalid_value: -inf from a silent microphone makes
  InfluxDB reject every upload (HTTP 400); guide end names it
- exclusive serial port on macOS/Linux: two tool windows no longer split
  the log between them
- InfluxDB check: `since` filter, neutral wording when nothing new arrives

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_guides.py

@@ -334,3 +334,15 @@ def test_quick_check_green_ends_with_influx_check(influx_rig):
     runner.answer("GREEN")
     runner.answer("0")                           # heartbeat blinking
     assert runner.guide.id == "influx" and actions == ["influx"]
+
+
+def test_influx_rejected_upload_is_named(influx_rig):
+    engine, runner, clock, actions, board = influx_rig
+    board(*BOOT, "microphone,device=A4CB8FC9473C dbfs=-inf,db=-inf 1790805114000000000",
+          "io,device=A4CB8FC9473C dbfs=-inf,db=-inf 1790805215000000000")   # USB dropped characters
+    assert sum(k.startswith("influx.invalid_value") for k in engine.findings) == 1
+    runner.start("influx")
+    runner.influx_result("silent", "No new data in InfluxDB since the test started")
+    clock.t += 300
+    runner.tick()
+    assert runner.end.id == "invalid_value"

tests/test_influx.py

@@ -67,7 +67,7 @@ def test_offline_box_whose_sensors_stopped_before_status():
     latest = {"device_status": _t(29 * 60), "microphone": _t(29 * 60),
               "as7341_adc": _t(21 * 1440), "bme688": _t(21 * 1440), "sen66": _t(21 * 1440)}
     c = influx.classify(latest, NOW)
-    assert c.outcome == influx.SENSORS_MISSING and "offline now" in c.summary
+    assert c.outcome == influx.SENSORS_MISSING and "Nothing new" in c.summary
     assert any("stopped" in d for d in c.details)
     assert any("21 days ago" in d for d in c.details)
 
@@ -140,3 +140,15 @@ def test_check_device_sends_token_header_and_normalized_mac(monkeypatch):
     assert req.get_header("Authorization") == "Token tok"
     assert "tok" not in req.full_url and req.full_url.endswith("/api/v2/query?org=kota")
     assert b'"A4CB8FC9473C"' in req.data
+
+
+def test_since_ignores_data_from_before_the_test():
+    # healthy a few minutes ago, but nothing since the box was restarted by the test
+    latest = {"device_status": _t(5), "microphone": _t(5), "as7341_adc": _t(5), "bme688": _t(5), "sen66": _t(5)}
+    assert influx.classify(latest, NOW).outcome == influx.OK
+    c = influx.classify(latest, NOW, since=_t(2))
+    assert c.outcome == influx.SILENT and "since the test started" in c.summary
+    latest.update(device_status=_t(0), microphone=_t(0))
+    assert influx.classify(latest, NOW, since=_t(2)).outcome == influx.SENSORS_MISSING
+    latest.update(as7341_adc=_t(0), bme688=_t(0), sen66=_t(2.5))   # within the clock slack
+    assert influx.classify(latest, NOW, since=_t(2)).outcome == influx.OK

tests/test_ui.py

@@ -19,3 +19,34 @@ def test_main_window_builds_with_all_tabs():
     assert "InfluxDB access..." in settings
     w.serial_tab.shutdown()
     app.processEvents()
+
+
+def test_serial_tab_checklist_and_test_strip():
+    from PySide6.QtWidgets import QApplication
+
+    from kota_tech.core.logline import parse_line
+    from kota_tech.service import influx
+    from kota_tech.ui.main_window import INFLUX_ROW, MainWindow
+    app = QApplication.instance() or QApplication([])
+    w = MainWindow()
+    st = w.serial_tab
+    assert st.test_btn.text().endswith("Test box")
+    assert [st.side_tabs.tabText(i) for i in range(st.side_tabs.count())] == \
+        ["Live log", "Guided troubleshooting", "Box details"]
+    st.influx_config = lambda: None                              # no token (never touch real settings)
+    rows = st._cloud_rows()
+    assert rows[0][0] == "off" and "not set up" in rows[0][1]
+    st.influx_config = lambda: influx.InfluxConfig("t")          # pretend access is set up
+    assert st._cloud_rows()[0] == ("pending", f"{INFLUX_ROW} - press Test box")
+    st._on_influx(influx.InfluxCheck(influx.SENSORS_MISSING, "Status arrives, sensor data does not",
+                                     details=["SEN66 (air quality): no data"]))
+    rows = st._cloud_rows()
+    assert rows[0][0] == "bad" and rows[1][0] == "note"
+    st._engine.feed(parse_line("ESP-ROM:esp32s3-20210327"))
+    st._diag_dirty = True
+    st._refresh_diag()
+    texts = [st.diag.milestones.item(i).text() for i in range(st.diag.milestones.count())]
+    assert any(INFLUX_ROW in t for t in texts)
+    assert "Test box" in st.test_status.text()
+    st.shutdown()
+    app.processEvents()