Backport PR #6589 (minimap and canvas bg color tokens) to core/1.30 (#6714)

## Summary
Backport of PR #6589 (commit 549ef79)
from main to core/1.30 branch.

Updates minimap and canvas background colors to use menu color tokens
(`--comfy-menu-bg`) for consistency across the interface.

## Changes
- Updated minimap container and panel backgrounds to use semantic color
tokens
- Updated canvas menu and zoom controls backgrounds to use consistent
tokens
- Updated user avatar, login button, and other interface elements
- Resolved 20 binary browser test snapshot conflicts using backportee's
copy
- Fixed 8 Vue component conflicts by accepting semantic token changes

## Resolved Conflicts
- **Binary snapshots (20 files)**: Used --theirs (backportee's copy) as
instructed
- **Source files (8 files)**: Accepted cherry-picked semantic token
changes
  - TopMenuSection.vue, UserAvatar.vue, CanvasModeSelector.vue
  - GraphCanvasMenu.vue, ZoomControlsModal.vue, LoginButton.vue  
  - MiniMap.vue, MiniMapPanel.vue

All linting and TypeScript checks passed.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6714-Backport-PR-6589-minimap-and-canvas-bg-color-tokens-to-core-1-30-2ad6d73d3650811d9c82d1e5f3a81a38)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>

Author: 3 people