feat(ui): Add project theme selection to context menu

[Shironex]

Summary

• Add theme submenu to project context menu for per-project theme override capability
• Refactor code following clean-code.md guidelines: extract reusable ThemeButton and ThemeColumn components (DRY principle)
• Replace magic z-index values with named constants for better maintainability
• Reuse existing theme constants and useThemePreview hook from sidebar

Changes

• Extract ThemeButton memoized component for individual theme option buttons
• Extract ThemeColumn memoized component for dark/light theme sections
• Add Z_INDEX constants object for context menu and submenu z-index values
• Add ThemeOption interface for type safety

Test plan

• Open project context menu (right-click on project in sidebar)
• Verify "Project Theme" submenu appears with chevron icon
• Hover over theme options to see live preview
• Select a theme to apply it to the project
• Verify "Use Global" option correctly falls back to global theme
• Test both dark and light theme columns display correctly

Preview

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[gemini-code-assist]

Summary of Changes

Hello @Shironex, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the user interface by introducing per-project theme selection directly accessible from the project context menu. This allows for greater customization and visual distinction between projects. Alongside this new feature, the PR includes substantial refactoring, breaking down complex UI logic into smaller, reusable components and replacing magic numbers with named constants, which collectively improves the codebase's maintainability and scalability.

Highlights

• Per-Project Theme Selection: Introduced a new 'Project Theme' submenu within the project context menu, allowing users to override the global theme for individual projects.
• UI Component Refactoring: Extracted ThemeButton and ThemeColumn into reusable, memoized components, adhering to DRY principles and improving code maintainability.
• Z-Index Management: Replaced hardcoded z-index values with named Z_INDEX constants for better clarity and maintainability of UI layering.
• Theme System Integration: Integrated existing theme constants (PROJECT_DARK_THEMES, PROJECT_LIGHT_THEMES) and the useThemePreview hook from the sidebar for consistent theme management and live preview functionality.
• Type Safety Enhancement: Added a ThemeOption interface to improve type safety for theme-related data structures.

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[gemini-code-assist]

Code Review

This pull request does a great job of adding the project-specific theme selection feature. The code is well-refactored into reusable ThemeButton and ThemeColumn components, and the use of constants for z-index values is a good practice for maintainability. I have a few suggestions to enhance type safety and improve the robustness of the UI interactions for the new theme submenu.