feat(scheduler): persist recurring daily starts

Add a local-calendar daily start scheduler with pending receipts, per-day deduplication, DST-safe target calculation, missed-day recovery, and retryable account/start failure outcomes.

Persist and validate the daily rule, expose its next target to the renderer, preserve legacy one-time schedules until a daily rule is saved, and gate boot auto-resume on recorded active-run evidence.

Wire boot, settings, account, suspend, resume, interval, and shutdown lifecycle handling with focused RED/GREEN coverage for calendar, persistence, renderer, and controller boundaries.

tests/renderer-settings.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, it } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 import { defaultSettings } from "../src/main/constants";
 import { createRendererSettings } from "../src/main/renderer-state";
 import { validateRendererSettingsUpdate } from "../src/main/renderer-settings";
@@ -73,4 +73,54 @@ describe("renderer settings validation", () => {
     expect(projected.archivePasswordListConfigured).toBe(true);
     expect(JSON.stringify(projected)).not.toContain(password);
   });
+
+  it("projects daily start state and accepts only editable calendar controls", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date(2026, 7, 22, 9, 0));
+    try {
+      const current = {
+        ...defaultSettings(),
+        dailyStartEnabled: true,
+        dailyStartMinuteOfDay: 18 * 60 + 45,
+        dailyStartFirstLocalDate: "2026-08-23",
+        dailyStartLastHandledLocalDate: "2026-08-22",
+        dailyStartPendingLocalDate: "",
+        dailyStartLastOutcome: "started" as const
+      };
+      const projected = createRendererSettings(current);
+
+      expect(projected).toMatchObject({
+        dailyStartEnabled: true,
+        dailyStartMinuteOfDay: 18 * 60 + 45,
+        dailyStartFirstLocalDate: "2026-08-23",
+        dailyStartLastHandledLocalDate: "2026-08-22",
+        dailyStartPendingLocalDate: "",
+        dailyStartLastOutcome: "started"
+      });
+      expect(projected.nextDailyStartEpochMs).toBe(new Date(2026, 7, 23, 18, 45, 0, 0).getTime());
+      expect(validateRendererSettingsUpdate({
+        dailyStartEnabled: true,
+        dailyStartMinuteOfDay: 7 * 60 + 30,
+        dailyStartFirstLocalDate: "2026-08-24",
+        dailyStartLastHandledLocalDate: "2026-08-23",
+        dailyStartPendingLocalDate: "2026-08-24",
+        dailyStartLastOutcome: "missed",
+        nextDailyStartEpochMs: 123
+      }, current)).toEqual({
+        dailyStartEnabled: true,
+        dailyStartMinuteOfDay: 7 * 60 + 30,
+        dailyStartFirstLocalDate: "2026-08-24"
+      });
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("rejects invalid editable daily calendar values at the renderer boundary", () => {
+    const current = defaultSettings();
+
+    expect(() => validateRendererSettingsUpdate({ dailyStartMinuteOfDay: 1_440 }, current)).toThrow("Settings-Payload ist ungültig");
+    expect(() => validateRendererSettingsUpdate({ dailyStartMinuteOfDay: 12.5 }, current)).toThrow("Settings-Payload ist ungültig");
+    expect(() => validateRendererSettingsUpdate({ dailyStartFirstLocalDate: "2026-02-29" }, current)).toThrow("Settings-Payload ist ungültig");
+  });
 });