[verified] feat: add live river dashboard

Add mapped river and ThaiWater sensor layers, PostgreSQL history charts, API endpoints, and dashboard tests.

tests/test_dashboard.py

@@ -0,0 +1,46 @@
+from pathlib import Path
+
+
+DASHBOARD_PATH = Path(__file__).parents[1] / "src" / "static" / "dashboard.html"
+
+
+def test_dashboard_contains_live_map_and_flow_visualization():
+    html = DASHBOARD_PATH.read_text(encoding="utf-8")
+
+    assert "id=\"station-map\"" in html
+    assert "id=\"river-flow\"" in html
+    assert "fetch('/stations')" in html or 'fetch("/stations")' in html
+    assert "fetch('/measurements/latest" in html or 'fetch(\"/measurements/latest' in html
+    assert "leaflet" in html.lower()
+
+
+def test_dashboard_explains_flow_legend_and_refresh():
+    html = DASHBOARD_PATH.read_text(encoding="utf-8")
+
+    assert "Flow status" in html
+    assert "Last updated" in html
+    assert "Refresh" in html
+
+
+def test_dashboard_uses_mapped_river_network_instead_of_station_connections():
+    html = DASHBOARD_PATH.read_text(encoding="utf-8")
+    river_network = DASHBOARD_PATH.with_name("ping-river-network.geojson")
+
+    assert river_network.exists()
+    assert "fetch('/static/ping-river-network.geojson')" in html
+    assert "mainBasin.map" not in html
+
+
+def test_dashboard_loads_additional_thaiwater_sensors():
+    html = DASHBOARD_PATH.read_text(encoding="utf-8")
+
+    assert "fetch('/sensors/thaiwater')" in html
+    assert "Additional ThaiWater sensor" in html
+
+
+def test_dashboard_loads_postgresql_history_chart():
+    html = DASHBOARD_PATH.read_text(encoding="utf-8")
+
+    assert "PostgreSQL history" in html
+    assert "/measurements/history/" in html
+    assert "history-chart" in html