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/_time_tracking_interface.html

@@ -1,5 +1,5 @@
 <!-- Time Tracking Interface - Shared Component -->
-<div class="time-tracking-container">
+<div class="page-container">
     <!-- Header Section -->
     <div class="page-header">
         <div class="header-content">

templates/analytics.html

@@ -1,7 +1,7 @@
 {% extends "layout.html" %}
 
 {% block content %}
-<div class="page-container timetrack-container">
+<div class="page-container">
     <div class="page-header">
         <div class="header-content">
             <div class="header-left">

templates/create_project.html

@@ -1,7 +1,7 @@
 {% extends "layout.html" %}
 
 {% block content %}
-<div class="timetrack-container">
+<div class="page-container">
     <h2>Create New Project</h2>
     
     <form method="POST" action="{{ url_for('projects.create_project') }}" class="project-form">

templates/edit_project.html

@@ -1,7 +1,7 @@
 {% extends "layout.html" %}
 
 {% block content %}
-<div class="timetrack-container">
+<div class="page-container">
     <h2>Edit Project: {{ project.name }}</h2>
     
     <form method="POST" action="{{ url_for('projects.edit_project', project_id=project.id) }}" class="project-form">

templates/export.html

@@ -1,7 +1,7 @@
 {% extends "layout.html" %}
 
 {% block content %}
-<div class="timetrack-container">
+<div class="page-container">
     <h2>Export Time Entries</h2>
     
     <div class="export-options">

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">

templates/manage_project_tasks.html

@@ -1,7 +1,7 @@
 {% extends "layout.html" %}
 
 {% block content %}
-<div class="page-container timetrack-container">
+<div class="page-container">
     <div class="page-header task-header">
         <div class="project-info">
             <h2>Tasks for Project: {{ project.code }} - {{ project.name }}</h2>

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">