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/index_old.html

@@ -146,7 +146,7 @@
 {% else %}
 
 <!-- Include the modern time tracking interface from time_tracking.html -->
-<div class="time-tracking-container">
+<div class="page-container">
     <!-- Header Section -->
     <div class="page-header">
         <div class="header-content">