refactor(08-02): tighten ical.d.ts shim and fix 4 non-ambient any sites

- ical.d.ts: getValues() return tightened to Array<Time | Duration |
  string> (Amendment A2); add Property.jCal: unknown[] to codify the
  internal access used at CalendarService.ts:940 and IcsImportService.ts:101
- eslint.config.mjs: add **/*.d.ts no-explicit-any: off exclusion (D-08)
- CalendarService.ts:317 — isValidCache(cache: unknown) with the
  canonical narrowing from RESEARCH.md Pitfall 3 (Record<string, unknown>
  intermediate + typeof/Array.isArray checks)
- CalendarService.ts:771 — forEach((value: Time | Duration | string))
  via tightened getValues(); narrow via value instanceof Time
- CalendarService.ts:940 — (dtstart as any).jCal -> dtstart.jCal via shim
- IcsImportService.ts:101 — same
- SettingsTab.ts:1180 — generatePreviewPath(event: Pick<CalendarEvent,
  'title' | 'start' | 'end' | 'source'>)

eslint.config.mjs

@@ -62,6 +62,14 @@ export default tseslint.config(
     },
   },
 
+  // D-08 — Ambient .d.ts shims are excluded from no-explicit-any. Hand-typing
+  // untyped third-party libraries (ical.js) is out of scope; the cheapest
+  // correct close per CONTEXT.md D-08.
+  {
+    files: ["**/*.d.ts"],
+    rules: { "@typescript-eslint/no-explicit-any": "off" },
+  },
+
   // ---------------------------------------------------------------------------
   // Phase 8 — DIR-01 / DIR-09 / DIR-10 will remove these when type-hygiene
   // and console-discipline land.

src/services/CalendarService.ts

@@ -1,5 +1,5 @@
 import { requestUrl, Platform, Notice, TFile } from "obsidian";
-import { Component, Event as ICalEvent, parse, Time } from "ical.js";
+import { Component, Duration, Event as ICalEvent, parse, Time } from "ical.js";
 import { CalendarSource } from "../settings/types";
 import MemoChron from "../main";
 import {
@@ -314,9 +314,12 @@ export class CalendarService {
     return JSON.parse(cacheFile);
   }
 
-  private isValidCache(cache: any): cache is CacheData {
+  private isValidCache(cache: unknown): cache is CacheData {
+    if (!cache || typeof cache !== "object") return false;
+    const c = cache as Record<string, unknown>;
     return (
-      cache && cache.timestamp && cache.events && Array.isArray(cache.events)
+      typeof c.timestamp === "number" &&
+      Array.isArray(c.events)
     );
   }
 
@@ -768,8 +771,8 @@ export class CalendarService {
     const exdateProps = vevent.getAllProperties("exdate");
     for (const exdateProp of exdateProps) {
       const values = exdateProp.getValues();
-      values.forEach((value: any) => {
-        if (value?.toJSDate) {
+      values.forEach((value: Time | Duration | string) => {
+        if (value instanceof Time) {
           excludedDates.push(value.toJSDate());
         }
       });
@@ -937,7 +940,7 @@ export class CalendarService {
     
     // Also check if the type is 'date' in the jCal representation
     // This handles cases where ical.js represents date-only values differently
-    const jcal = (dtstart as any).jCal;
+    const jcal = dtstart.jCal;
     if (jcal && jcal[2] === "date") return true;
     
     return false;

src/services/IcsImportService.ts

@@ -97,7 +97,7 @@ export class IcsImportService {
 
     // Also check if the type is 'date' in the jCal representation
     // This handles cases where ical.js represents date-only values differently
-    const jcal = (dtstart as any).jCal;
+    const jcal = dtstart.jCal;
     if (jcal && jcal[2] === "date") return true;
 
     return false;

src/settings/SettingsTab.ts

@@ -12,6 +12,7 @@ import {
 } from "obsidian";
 import MemoChron from "../main";
 import { CalendarSource } from "./types";
+import { CalendarEvent } from "../services/CalendarService";
 import { isValidColor } from "../utils/colorValidation";
 import { errorMessage } from "../utils/errors";
 
@@ -1177,7 +1178,10 @@ export class SettingsTab extends PluginSettingTab {
     }
   }
 
-  private generatePreviewPath(template: string, event: any): string {
+  private generatePreviewPath(
+    template: string,
+    event: Pick<CalendarEvent, "title" | "start" | "end" | "source">
+  ): string {
     const monthNames = [
       "January",
       "February",

src/types/ical.d.ts

@@ -11,7 +11,8 @@ declare module "ical.js" {
   export class Property {
     getFirstValue(): any;
     getParameter(name: string): string;
-    getValues(): any[];
+    getValues(): Array<Time | Duration | string>;
+    jCal: unknown[];
   }
 
   export class Event {