Fix Time Tracking header jump by standardizing container classes

- Replace time-tracking-container with page-container for consistency
- Update all timetrack pages to use standard page-container class
- Remove duplicate timetrack-container class references
- This ensures consistent header positioning across all pages

templates/timetrack.html

@@ -1,7 +1,7 @@
 {% extends "layout.html" %}
 
 {% block content %}
-<div class="timetrack-container">
+<div class="page-container">
     <h1>Time Tracking</h1>
 
     <div class="timer-section">