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/models/AngelusStreak.ts

@@ -0,0 +1,24 @@
+import mongoose from 'mongoose';
+
+const AngelusStreakSchema = new mongoose.Schema(
+  {
+    username: { type: String, required: true, unique: true },
+    streak: { type: Number, required: true, default: 0 },
+    lastComplete: { type: String, default: null }, // YYYY-MM-DD of last fully-completed day
+    todayPrayed: { type: Number, required: true, default: 0 }, // bitmask: 1=morning, 2=noon, 4=evening
+    todayDate: { type: String, default: null } // YYYY-MM-DD
+  },
+  { timestamps: true }
+);
+
+interface IAngelusStreak {
+  username: string;
+  streak: number;
+  lastComplete: string | null;
+  todayPrayed: number;
+  todayDate: string | null;
+}
+
+let _model: mongoose.Model<IAngelusStreak>;
+try { _model = mongoose.model<IAngelusStreak>("AngelusStreak"); } catch { _model = mongoose.model<IAngelusStreak>("AngelusStreak", AngelusStreakSchema); }
+export const AngelusStreak = _model;