chore(cleanup): trim 13 dead exports surfaced by knip

Narrow each helper's visibility to its actual reach instead of leaving
it exported "just in case":

  - Drop the `export` keyword on file-local helpers / constants:
    `getTrendSentiment`, `isPRWithin30Days`, `buildCoachMetricSourceType`,
    `countPassedSchedules`, `getGithubConfig`, `isComparisonBaseline`,
    `DASHBOARD_LAYOUT_VERSION`, `INTL_LOCALE_MAP`, `SIDE_EFFECT_NOTES_MAX`,
    `MEDICATION_CATEGORIES`, `openApiBase`, `ALL_MOOD_GRANULARITIES`.
  - Remove never-used dead code:
    `CodexOAuthNotConfiguredError` (declared as a backwards-compat shim
    no caller ever consumed), `editMessageReplyMarkup` (Telegram method
    nothing on the bot dispatch tree calls), and the stale
    `DISPLAY_TIMEZONE` re-export from `src/lib/format.ts`.

Knip drops from 48 -> 35 unused exports. Pure narrowing / deletion;
no behaviour change.

src/components/charts/trend-card.tsx

@@ -64,7 +64,7 @@ export type TrendDirectionSentiment = "up-good" | "up-bad" | "neutral";
  */
 export type TrendSentimentDirection = "positive" | "negative" | "neutral";
 
-export function getTrendSentiment(
+function getTrendSentiment(
   change: number | null | undefined,
   sentiment: TrendDirectionSentiment,
 ): TrendSentimentDirection {

src/components/insights/personal-record-badge.tsx

@@ -52,14 +52,12 @@ interface PersonalRecordBadgeProps {
 const THIRTY_DAYS_MS = 30 * 24 * 60 * 60 * 1000;
 
 /**
- * Pure freshness check — exported for unit testing so the component
- * itself stays free of clock calls (the React purity linter rejects
- * `Date.now()` inside a component body or hook initializer). Callers
- * pass a `now` reference; consumers in production read it from the
- * surrounding query refetch boundary where one stale-time tick =
- * one new clock reading.
+ * Pure freshness check kept out of the component body so the React
+ * purity linter doesn't trip on the `Date.now()` reference; callers
+ * pass `now` from the surrounding query refetch boundary where one
+ * stale-time tick = one new clock reading.
  */
-export function isPRWithin30Days(achievedAtIso: string, now: number): boolean {
+function isPRWithin30Days(achievedAtIso: string, now: number): boolean {
   const ts = new Date(achievedAtIso).getTime();
   return Number.isFinite(ts) && now - ts <= THIRTY_DAYS_MS;
 }

src/lib/ai/codex-oauth.ts

@@ -53,20 +53,6 @@ export function generateState(): string {
   return base64url(randomBytes(32));
 }
 
-/**
- * Backwards-compatible no-op type. Older callers that imported the error
- * type continue to compile. Codex OAuth always considers itself
- * configured because we ship the public client ID as the default.
- */
-export class CodexOAuthNotConfiguredError extends Error {
-  constructor() {
-    super(
-      "Codex OAuth is not configured on this instance — set CODEX_OAUTH_CLIENT_ID",
-    );
-    this.name = "CodexOAuthNotConfiguredError";
-  }
-}
-
 export function getCodexClientId(): string {
   return process.env.CODEX_OAUTH_CLIENT_ID?.trim() || DEFAULT_CLIENT_ID;
 }

src/lib/ai/feedback-attribution.ts

@@ -106,7 +106,7 @@ export interface CoachFeedbackAttribution extends FeedbackAttribution {
   metricSourceType: string;
 }
 
-export function buildCoachMetricSourceType(
+function buildCoachMetricSourceType(
   tone: string,
   verbosity: string,
 ): string {

src/lib/dashboard-layout.ts

@@ -91,7 +91,7 @@ export interface DashboardWidgetConfig {
 export const COMPARISON_BASELINES = ["none", "lastMonth", "lastYear"] as const;
 export type ComparisonBaseline = (typeof COMPARISON_BASELINES)[number];
 
-export function isComparisonBaseline(
+function isComparisonBaseline(
   value: unknown,
 ): value is ComparisonBaseline {
   return (
@@ -196,7 +196,7 @@ export interface DashboardLayout {
   chartOverlayPrefs?: ChartOverlayPrefsMap;
 }
 
-export const DASHBOARD_LAYOUT_VERSION = 1;
+const DASHBOARD_LAYOUT_VERSION = 1;
 
 /**
  * Default layout mirrors v1.1 behavior: core vitals always on, mood +

src/lib/feedback/publish-github.ts

@@ -37,7 +37,7 @@ export class GithubPublishError extends Error {
  * Resolves the configured GitHub token + repo from AppSettings (or env).
  * Returns null if no configuration is present (caller should treat as 503).
  */
-export async function getGithubConfig(): Promise<{
+async function getGithubConfig(): Promise<{
   token: string;
   repo: string;
 } | null> {

src/lib/format-locale.ts

@@ -29,7 +29,7 @@ export const DISPLAY_TIMEZONE = "Europe/Berlin";
  * `Intl.*`. When we add locales, extend this map — do not rely on the short
  * tag directly since browsers differ in how they handle "en" vs "en-US".
  */
-export const INTL_LOCALE_MAP: Record<Locale, string> = {
+const INTL_LOCALE_MAP: Record<Locale, string> = {
   de: "de-DE",
   en: "en-US",
   fr: "fr-FR",

src/lib/format.ts

@@ -15,11 +15,9 @@
  * stay consistent with the server-rendered locale.
  */
 
-import { makeFormatters, DISPLAY_TIMEZONE } from "./format-locale";
+import { makeFormatters } from "./format-locale";
 import type { Locale } from "./i18n/config";
 
-export { DISPLAY_TIMEZONE };
-
 function activeLocale(): Locale {
   if (typeof document === "undefined") return "en";
   // Prefer the cookie (what SSR used) over localStorage to stay in sync

src/lib/medication-category.ts

@@ -1,7 +1,7 @@
 import { prisma } from "@/lib/db";
 import { MEDICATION_CATEGORY_VALUES } from "@/lib/validations/medication";
 
-export const MEDICATION_CATEGORIES = MEDICATION_CATEGORY_VALUES;
+const MEDICATION_CATEGORIES = MEDICATION_CATEGORY_VALUES;
 
 export type MedicationCategory = (typeof MEDICATION_CATEGORIES)[number];
 

src/lib/medications/side-effects/validators.ts

@@ -40,7 +40,7 @@ export const SIDE_EFFECT_ENTRY_VALUES = Object.values(
   MedicationSideEffectEntry,
 ) as readonly MedicationSideEffectEntry[];
 
-export const SIDE_EFFECT_NOTES_MAX = 280;
+const SIDE_EFFECT_NOTES_MAX = 280;
 
 /**
  * v1.4.25 W21 Fix-N (code-M6) — `category` was dropped from the wire

src/lib/medications/window-status.ts

@@ -124,7 +124,7 @@ function isLastIntakeInCurrentWindow<Schedule extends ScheduleWindowInput>(
  * to suppress "overdue" pills once the user has already covered every
  * passed schedule with intake events for the day.
  */
-export function countPassedSchedules<Schedule extends ScheduleWindowInput>(
+function countPassedSchedules<Schedule extends ScheduleWindowInput>(
   schedules: Schedule[],
   nowBerlin: Date,
 ): number {

src/lib/openapi/registry.ts

@@ -26,7 +26,7 @@ import { createDocument, type ZodOpenApiObject } from "zod-openapi";
 
 import { openApiPaths, openApiComponents } from "./routes";
 
-export const openApiBase: Pick<
+const openApiBase: Pick<
   ZodOpenApiObject,
   "openapi" | "info" | "servers" | "tags"
 > = {

src/lib/rollups/mood-rollups.ts

@@ -51,7 +51,7 @@ import type {
 const ASYNC_GRANULARITIES: RollupGranularity[] = ["WEEK", "MONTH", "YEAR"];
 
 /** All granularities the rollup table tracks. */
-export const ALL_MOOD_GRANULARITIES: RollupGranularity[] = [
+const ALL_MOOD_GRANULARITIES: RollupGranularity[] = [
   "DAY",
   "WEEK",
   "MONTH",

src/lib/telegram.ts

@@ -115,25 +115,6 @@ export async function answerTelegramCallbackQuery(
   return json.ok;
 }
 
-export async function editMessageReplyMarkup(
-  botToken: string,
-  chatId: string,
-  messageId: number,
-  replyMarkup?: TelegramReplyMarkup,
-): Promise<boolean> {
-  const json = await telegramApiRequest(botToken, "editMessageReplyMarkup", {
-    chat_id: chatId,
-    message_id: messageId,
-    reply_markup: replyMarkup ?? { inline_keyboard: [] },
-  });
-  if (!json.ok) {
-    getEvent()?.addWarning(
-      `[telegram] editMessageReplyMarkup failed: ${json.description}`,
-    );
-  }
-  return json.ok;
-}
-
 export async function setTelegramWebhook(
   botToken: string,
   webhookUrl: string,