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;

frontend/components/dashboard/scan-terminal/AiForecastKPIBar.tsx

@@ -1,5 +1,6 @@
 import type { CityDetail, ScanOpportunityRow } from "@/lib/dashboard-types";
-import { formatTemperatureValue, getTodayPaceView } from "@/lib/dashboard-utils";
+import { getTodayPaceView } from "@/lib/dashboard-utils";
+import { formatTemperatureValue } from "@/lib/temperature-utils";
 import { getPeakWindowLabel } from "@/components/dashboard/scan-terminal/decision-utils";
 
 export function AiForecastKPIBar({

frontend/components/dashboard/scan-terminal/AiPinnedCityCard.tsx

@@ -21,7 +21,8 @@ import {
   useCityMarketScan,
 } from "@/components/dashboard/scan-terminal/use-ai-city-card-data";
 import type { CityDetail, ScanOpportunityRow } from "@/lib/dashboard-types";
-import { formatTemperatureValue, getModelView, getTodayPaceView } from "@/lib/dashboard-utils";
+import { getModelView, getTodayPaceView } from "@/lib/dashboard-utils";
+import { formatTemperatureValue } from "@/lib/temperature-utils";
 
 function toFiniteDecisionNumber(value: unknown) {
   if (value == null || value === "") return null;

frontend/components/dashboard/scan-terminal/CalendarView.tsx

@@ -2,7 +2,7 @@ import { memo, useEffect, useMemo, useState } from "react";
 import { getWindowPhaseMeta } from "@/components/dashboard/OpportunityTable";
 import type { ScanOpportunityRow } from "@/lib/dashboard-types";
 import { getLocalizedCityName } from "@/lib/dashboard-home-copy";
-import { formatTemperatureValue } from "@/lib/dashboard-utils";
+import { formatTemperatureValue } from "@/lib/temperature-utils";
 import {
   formatShortDate,
   getPeakCountdownMeta,

frontend/components/dashboard/scan-terminal/OpportunityOverview.tsx

@@ -1,7 +1,7 @@
 import { memo, useMemo } from "react";
 import clsx from "clsx";
 import type { ScanOpportunityRow, ScanTerminalResponse } from "@/lib/dashboard-types";
-import { formatTemperatureValue } from "@/lib/dashboard-utils";
+import { formatTemperatureValue } from "@/lib/temperature-utils";
 import { LoadingSignal } from "@/components/dashboard/scan-terminal/LoadingSignal";
 import {
   formatRowPrice,

frontend/components/dashboard/scan-terminal/city-card-decision-utils.ts

@@ -1,9 +1,9 @@
 import type { MarketScan, MarketTopBucket } from "@/lib/dashboard-types";
+import { getTodayPaceView } from "@/lib/dashboard-utils";
 import {
   formatTemperatureValue,
-  getTodayPaceView,
   normalizeTemperatureLabel,
-} from "@/lib/dashboard-utils";
+} from "@/lib/temperature-utils";
 import type { AiCityForecastPayload } from "@/components/dashboard/scan-terminal/types";
 
 export type WeatherDecisionView = {

frontend/lib/dashboard-utils.ts

@@ -6,6 +6,17 @@ import {
   NearbyStation,
 } from "@/lib/dashboard-types";
 import { normalizeObservationSourceLabel } from "@/lib/source-labels";
+import {
+  formatTemperatureValue,
+  normalizeTemperatureLabel,
+  normalizeTemperatureSymbol,
+} from "@/lib/temperature-utils";
+
+export {
+  formatTemperatureValue,
+  normalizeTemperatureLabel,
+  normalizeTemperatureSymbol,
+} from "@/lib/temperature-utils";
 
 const METAR_WX_MAP: Record<
   string,
@@ -45,42 +56,6 @@ function containsCjk(text: string) {
   return /[\u3400-\u9fff]/.test(text);
 }
 
-export function normalizeTemperatureSymbol(value?: string | null) {
-  return String(value || "").toUpperCase().includes("F") ? "°F" : "°C";
-}
-
-export function formatTemperatureValue(
-  value: number | null | undefined,
-  symbol?: string | null,
-  options?: { signed?: boolean; digits?: number },
-) {
-  const numeric = Number(value);
-  if (!Number.isFinite(numeric)) return "--";
-  const digits = options?.digits ?? 0;
-  const sign = options?.signed && numeric >= 0 ? "+" : "";
-  return `${sign}${numeric.toFixed(digits)}${normalizeTemperatureSymbol(symbol)}`;
-}
-
-export function normalizeTemperatureLabel(
-  label?: string | null,
-  fallbackSymbol?: string | null,
-) {
-  const raw = String(label || "").trim();
-  if (!raw) return "";
-  const normalizedSymbol = normalizeTemperatureSymbol(fallbackSymbol);
-  let next = raw.replace(/℃/gi, "°C");
-  next = next.replace(/°?([CF])\b/gi, (_, unit: string) => `°${unit.toUpperCase()}`);
-  if (!/[°][CF]/.test(next) && /\d/.test(next)) {
-    next = `${next}${normalizedSymbol}`;
-  }
-  if (normalizedSymbol === "°F") {
-    next = next.replace(/°C/g, "°F");
-  } else {
-    next = next.replace(/°F/g, "°C");
-  }
-  return next;
-}
-
 function getLocalizedDynamicCommentary(
   detail: CityDetail,
   locale: Locale,

frontend/lib/temperature-utils.ts

@@ -0,0 +1,35 @@
+export function normalizeTemperatureSymbol(value?: string | null) {
+  return String(value || "").toUpperCase().includes("F") ? "°F" : "°C";
+}
+
+export function formatTemperatureValue(
+  value: number | null | undefined,
+  symbol?: string | null,
+  options?: { signed?: boolean; digits?: number },
+) {
+  const numeric = Number(value);
+  if (!Number.isFinite(numeric)) return "--";
+  const digits = options?.digits ?? 0;
+  const sign = options?.signed && numeric >= 0 ? "+" : "";
+  return `${sign}${numeric.toFixed(digits)}${normalizeTemperatureSymbol(symbol)}`;
+}
+
+export function normalizeTemperatureLabel(
+  label?: string | null,
+  fallbackSymbol?: string | null,
+) {
+  const raw = String(label || "").trim();
+  if (!raw) return "";
+  const normalizedSymbol = normalizeTemperatureSymbol(fallbackSymbol);
+  let next = raw.replace(/℃/gi, "°C");
+  next = next.replace(/°?([CF])\b/gi, (_, unit: string) => `°${unit.toUpperCase()}`);
+  if (!/[°][CF]/.test(next) && /\d/.test(next)) {
+    next = `${next}${normalizedSymbol}`;
+  }
+  if (normalizedSymbol === "°F") {
+    next = next.replace(/°C/g, "°F");
+  } else {
+    next = next.replace(/°F/g, "°C");
+  }
+  return next;
+}