Refactor .gitignore; add patterns for SQLite database files and improve ignored file management

Enhance app initialization; set secret key from environment variable for better security practices

Update work_log model import; change User import path for improved module structure

Refactor routes; add new inventory item creation route and enhance settings handling with JSON form state

Improve ComboBoxWidget; add handleComboAdd function for better option management and integrate with render_combobox macro

Revamp settings template; implement form state management and improve modal functionality for room creation

Add error template; create a new error handling page for better user feedback

templates/error.html

@@ -0,0 +1,9 @@
+{% extends 'layout.html' %}
+
+{% block title %}{{ title }}{% endblock %}
+
+{% block content %}
+    <div class="alert alert-danger text-center">
+        {{ message }}
+    </div>
+{% endblock %}