feat: add log out button to sidebar header menu

[NagariaHussain]

Closes #600

[coderabbitai]

Walkthrough

The Sidebar component was updated to add a logout feature. The menu header configuration now includes two items instead of one: the existing "Toggle Theme" option and a new "Log out" action. The implementation adds imports for the logout icon and session store, introduces a logout handler that invokes the session store's logout method, and wires this handler to the menu item's click event.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a logout button to the sidebar header menu, which matches the changeset modifications in Sidebar.vue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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