added note detail view

Model/NotesModel.php

@@ -43,4 +43,22 @@ class NotesModel extends Database
             return false;
         }
     }
+
+    function getNoteById($noteId) {
+        $pdo = $this->linkDB();
+        if (!$pdo) return null;
+        try {
+            if ($_SESSION['role'] === 'admin') { // Admin can fetch any note
+                $stmt = $pdo->prepare("SELECT n.*, u.username as owner_username FROM notes n JOIN users u ON n.user_id = u.id WHERE n.id = ?");
+                $stmt->execute([$noteId]);
+            } else { // Regular user can only fetch their own notes
+                $stmt = $pdo->prepare("SELECT * FROM notes WHERE id = ? AND user_id = ?");
+                $stmt->execute([$noteId, $_SESSION['user_id']]);
+            }
+            return $stmt->fetch();
+        } catch (PDOException $e) {
+            error_log("Get Note Error: " . $e->getMessage());
+            return null;
+        }
+    }
 }