feat: implement ScanTerminalDashboard UI and state management with supporting tests

frontend/components/dashboard/scan-terminal/__tests__/cityDetailMergeChartCoverage.test.ts

@@ -21,4 +21,24 @@ export function runTests() {
     ),
     "deep-analysis refresh must not let sparse incoming hourly data overwrite chart-capable cached hourly data",
   );
+  assert(
+    source.includes("function pickRicherObservationSeries"),
+    "city detail merge should preserve chart observation series when refresh payload is sparse",
+  );
+  assert(
+    /metar_today_obs:\s*pickRicherObservationSeries\(\s*current\.metar_today_obs,\s*incoming\.metar_today_obs,?\s*\)/.test(
+      source,
+    ),
+    "deep-analysis refresh must not wipe METAR observation points used by the intraday path chart",
+  );
+  assert(
+    /settlement_today_obs:\s*pickRicherObservationSeries\(\s*current\.settlement_today_obs,\s*incoming\.settlement_today_obs,?\s*\)/.test(
+      source,
+    ),
+    "deep-analysis refresh must not wipe settlement observation points used by the intraday path chart",
+  );
+  assert(
+    /trend:\s*mergeTrendInfo\(\s*current\.trend,\s*incoming\.trend\s*\)/.test(source),
+    "deep-analysis refresh must merge trend.recent instead of replacing it with sparse trend payloads",
+  );
 }

frontend/components/dashboard/scan-terminal/__tests__/marketOverviewBadge.test.ts

@@ -7,6 +7,12 @@ function assert(condition: unknown, message: string) {
 
 export function runTests() {
   const projectRoot = process.cwd();
+  const dashboardPath = path.join(
+    projectRoot,
+    "components",
+    "dashboard",
+    "ScanTerminalDashboard.tsx",
+  );
   const bannerPath = path.join(
     projectRoot,
     "components",
@@ -14,6 +20,7 @@ export function runTests() {
     "scan-terminal",
     "MarketOverviewBanner.tsx",
   );
+  const dashboardSource = fs.readFileSync(dashboardPath, "utf8");
   const source = fs.readFileSync(bannerPath, "utf8");
 
   assert(
@@ -22,4 +29,8 @@ export function runTests() {
       !source.includes("styles.badge"),
     "market overview banner should not render the AI overview badge",
   );
+  assert(
+    !dashboardSource.includes("MarketOverviewBanner"),
+    "scan terminal dashboard should not mount the AI market overview banner",
+  );
 }