refactor(core): use @snowluma/common/coerce in config normalizers

Phase 2. notifications/config and webui/ui-config dropped their verbatim-
duplicated isObject/boolOr/clampInt (+ ui-config clampNum) in favor of the
shared @snowluma/common/coerce. Pure delete-and-import: the shared
primitives are byte-identical to the originals (adversarially verified),
so behavior is unchanged.

Kept local: strOr (notifications-only), oneOf/isFiniteNum/hexOr
(ui-specific). notifications-config suite green (21), core+common
typecheck clean.

packages/core/src/notifications/config.ts

@@ -7,6 +7,7 @@
 //
 // Channels are GLOBAL (defined once here); each UIN opts into a subset via
 // `OneBotConfig.notifications.channelIds` (see packages/onebot/src/config.ts).
+import { boolOr, clampInt, isObject } from '@snowluma/common/coerce';
 import { createLogger } from '@snowluma/common/logger';
 import fs from 'fs';
 import path from 'path';
@@ -92,21 +93,9 @@ export function renderTemplate(template: string, vars: Record<string, string>):
   });
 }
 
-// ─── Normalization helpers (replicated from ui-config conventions) ──────────
-
-function isObject(value: unknown): value is Record<string, unknown> {
-  return typeof value === 'object' && value !== null && !Array.isArray(value);
-}
-
-function boolOr(value: unknown, fallback: boolean): boolean {
-  return typeof value === 'boolean' ? value : fallback;
-}
-
-function clampInt(value: unknown, min: number, max: number, fallback: number): number {
-  const n = typeof value === 'number' ? value : typeof value === 'string' ? Number(value) : NaN;
-  if (!Number.isFinite(n)) return fallback;
-  return Math.trunc(Math.min(max, Math.max(min, n)));
-}
+// ─── Normalization helpers ──────────────────────────────────────────────────
+// isObject / boolOr / clampInt come from @snowluma/common/coerce. strOr is
+// notifications-only (string truncation to maxLen), so it stays here.
 
 function strOr(value: unknown, fallback: string, maxLen: number): string {
   return typeof value === 'string' ? value.slice(0, maxLen) : fallback;

packages/core/src/webui/ui-config.ts

@@ -1,3 +1,4 @@
+import { boolOr, clampInt, clampNum, isObject } from '@snowluma/common/coerce';
 import { createLogger } from '@snowluma/common/logger';
 import fs from 'fs';
 import path from 'path';
@@ -308,10 +309,8 @@ function defaultPages(): UiPages {
 }
 
 // ─── Normalization helpers ─────────────────────────────────────────────────
-
-function isObject(value: unknown): value is Record<string, unknown> {
-  return typeof value === 'object' && value !== null && !Array.isArray(value);
-}
+// isObject / boolOr / clampNum / clampInt come from @snowluma/common/coerce.
+// oneOf (enum), isFiniteNum, and hexOr (CSS color) are ui-specific and stay.
 
 function oneOf<T extends string>(value: unknown, allowed: readonly T[], fallback: T): T {
   return typeof value === 'string' && (allowed as readonly string[]).includes(value)
@@ -319,25 +318,11 @@ function oneOf<T extends string>(value: unknown, allowed: readonly T[], fallback
     : fallback;
 }
 
-function clampNum(value: unknown, min: number, max: number, fallback: number): number {
-  const n = typeof value === 'number' ? value : typeof value === 'string' ? Number(value) : NaN;
-  if (!Number.isFinite(n)) return fallback;
-  return Math.min(max, Math.max(min, n));
-}
-
-function clampInt(value: unknown, min: number, max: number, fallback: number): number {
-  return Math.trunc(clampNum(value, min, max, fallback));
-}
-
 function isFiniteNum(value: unknown): boolean {
   if (typeof value === 'number') return Number.isFinite(value);
   return typeof value === 'string' && value.trim() !== '' && Number.isFinite(Number(value));
 }
 
-function boolOr(value: unknown, fallback: boolean): boolean {
-  return typeof value === 'boolean' ? value : fallback;
-}
-
 const HEX_RE = /^#(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})$/;
 function hexOr(value: unknown, fallback: string): string {
   return typeof value === 'string' && HEX_RE.test(value.trim()) ? value.trim() : fallback;