style: simplify WebUI sidebar

[Soulter]

Summary

• Remove the AstrBot WebUI branding block from the expanded sidebar.
• Remove the divider above the Settings footer action.
• Delete the unused branding styles.

Why

The branding block and footer divider add unnecessary visual chrome and consume sidebar space. Removing them keeps the navigation focused on its actions.

Impact

The expanded sidebar now starts directly with the navigation items, and the Settings footer no longer has a top divider. Rail mode behavior is unchanged.

Validation

• pnpm typecheck
• uv run ruff format --check .
• uv run ruff check .
• git diff --check

Summary by Sourcery

Simplify the vertical sidebar layout by removing unused branding elements and visual separators to focus on navigation content.

Enhancements:

• Remove the AstrBot WebUI branding block from the expanded sidebar layout.
• Eliminate the top border divider from the non-rail sidebar footer to reduce visual chrome.

[gemini-code-assist]

Code Review

This pull request removes the brand logo and title header from the vertical sidebar, along with its associated CSS styles, and removes the top border from the sidebar footer. The reviewer suggested adjusting the footer's top padding to 16px to ensure symmetric and consistent spacing now that the border has been removed.

Important

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[gemini-code-assist]

Since the top border (border-top) of the footer has been removed, the top padding of 10px (which was likely reduced to account for the border's visual weight) can now be made symmetric with the other sides (16px). This will provide a more balanced and consistent spacing between the list items and the footer button.

.leftSidebar:not(.v-navigation-drawer--rail) .sidebar-footer {
  align-items: stretch;
  padding: 16px !important;
}

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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