Enhance: Google Photos integration, refinement of Schedule/Todo lists and API fixes

backend/routes/todos.js

@@ -23,7 +23,18 @@ router.get("/", async (req, res) => {
 router.get("/today", async (req, res) => {
   try {
     const { start, end } = getDayRange();
-    const todos = await Todo.find({ dueDate: { $gte: start, $lte: end } }).sort({
+    // Include:
+    // 1. Tasks due today
+    // 2. Overdue tasks (due before today) that are not completed
+    // 3. Tasks with no due date that are not completed
+    const todos = await Todo.find({
+      $or: [
+        { dueDate: { $gte: start, $lte: end } },
+        { dueDate: { $lt: start }, completed: false },
+        { dueDate: { $exists: false }, completed: false },
+        { dueDate: null, completed: false }
+      ]
+    }).sort({
       dueDate: 1,
       createdAt: -1,
     });