feat: add Latin route support, Angelus/Regina Caeli streak counter, and Eastertide liturgical adjustments

- Add /fides route with Latin-only mode for all faith pages (rosary, prayers, individual prayers)
- Add LA option to language selector for faith routes
- Add Angelus/Regina Caeli streak counter with 3x daily tracking (morning/noon/evening bitmask)
- Store streak data in localStorage (offline) and MongoDB (logged-in sync)
- Show Annunciation/Coronation paintings via StickyImage with artist captions
- Switch Angelus↔Regina Caeli in header and landing page based on Eastertide
- Fix Eastertide to end at Ascension (+39 days) instead of Pentecost
- Fix Lent Holy Saturday off-by-one with toMidnight() normalization
- Fix non-reactive typedLang in faith layout
- Fix header nav highlighting: exclude angelus/regina-caeli from prayers active state

src/routes/api/glaube/angelus-streak/+server.ts

@@ -0,0 +1,73 @@
+import { json, error, type RequestHandler } from '@sveltejs/kit';
+import { AngelusStreak } from '$models/AngelusStreak';
+import { dbConnect } from '$utils/db';
+
+export const GET: RequestHandler = async ({ locals }) => {
+  const session = await locals.auth();
+
+  if (!session?.user?.nickname) {
+    throw error(401, 'Authentication required');
+  }
+
+  await dbConnect();
+
+  try {
+    const streak = await AngelusStreak.findOne({
+      username: session.user.nickname
+    }).lean() as any;
+
+    return json({
+      streak: streak?.streak ?? 0,
+      lastComplete: streak?.lastComplete ?? null,
+      todayPrayed: streak?.todayPrayed ?? 0,
+      todayDate: streak?.todayDate ?? null
+    });
+  } catch (e) {
+    throw error(500, 'Failed to fetch angelus streak');
+  }
+};
+
+export const POST: RequestHandler = async ({ request, locals }) => {
+  const session = await locals.auth();
+
+  if (!session?.user?.nickname) {
+    throw error(401, 'Authentication required');
+  }
+
+  const { streak, lastComplete, todayPrayed, todayDate } = await request.json();
+
+  if (typeof streak !== 'number' || streak < 0) {
+    throw error(400, 'Valid streak required');
+  }
+
+  if (lastComplete !== null && typeof lastComplete !== 'string') {
+    throw error(400, 'Invalid lastComplete format');
+  }
+
+  if (typeof todayPrayed !== 'number' || todayPrayed < 0 || todayPrayed > 7) {
+    throw error(400, 'Invalid todayPrayed bitmask');
+  }
+
+  if (todayDate !== null && typeof todayDate !== 'string') {
+    throw error(400, 'Invalid todayDate format');
+  }
+
+  await dbConnect();
+
+  try {
+    const updated = await AngelusStreak.findOneAndUpdate(
+      { username: session.user.nickname },
+      { streak, lastComplete, todayPrayed, todayDate },
+      { upsert: true, new: true }
+    ).lean() as any;
+
+    return json({
+      streak: updated?.streak ?? 0,
+      lastComplete: updated?.lastComplete ?? null,
+      todayPrayed: updated?.todayPrayed ?? 0,
+      todayDate: updated?.todayDate ?? null
+    });
+  } catch (e) {
+    throw error(500, 'Failed to update angelus streak');
+  }
+};