Let temperature formatting ship without dashboard bulk

Temperature formatting was embedded in the large dashboard utility module, so small scan-terminal views had to import the heavy utility surface for simple labels. This moves the pure temperature helpers into a lightweight module while keeping dashboard-utils re-exports for compatibility.

Constraint: Preserve existing temperature text output and all dashboard-utils import compatibility.

Rejected: Split chart, pace, and model helpers in the same pass | those helpers have wider coupling and should move one boundary at a time.

Confidence: high

Scope-risk: narrow

Reversibility: clean

Tested: TypeScript diagnostics for temperature-utils, dashboard-utils, and OpportunityTable

Tested: npm run build

Not-tested: Bundle analyzer size comparison.

frontend/components/dashboard/OpportunityTable.tsx

@@ -9,13 +9,15 @@ import type {
 } from "@/lib/dashboard-types";
 import { getLocalizedCityName } from "@/lib/dashboard-home-copy";
 import {
-  formatTemperatureValue,
   getModelView,
   getProbabilityView,
   getTodayPaceView,
+} from "@/lib/dashboard-utils";
+import {
+  formatTemperatureValue,
   normalizeTemperatureLabel,
   normalizeTemperatureSymbol,
-} from "@/lib/dashboard-utils";
+} from "@/lib/temperature-utils";
 
 type PhaseMeta = {
   label: string;