chore(nav): remove New Note and New Directory buttons from nav (moved to Files sidebar header)

[danhilse]

Automated PR from fork branch 'feature/qol-sidebar-actions'.

[greptile-apps]

Greptile Summary

This PR relocates the "New Note" and "New Directory" buttons from the main navigation (IconsSidebar) to the Files sidebar header (FileSidebar). This is a UI/UX improvement that groups file creation actions with the file management interface rather than having them scattered in the main navigation.

The changes involve:

In IconsSidebar.tsx:

• Removes unused imports (VscNewFolder, HiOutlinePencilAlt)
• Removes the useContentContext hook that's no longer needed
• Removes setIsNewDirectoryModalOpen from the modal context destructuring
• Eliminates the button rendering logic for these two actions

In FileSidebar.tsx:

• Adds necessary imports for useModalOpeners and useContentContext
• Imports the required icons (VscNewFolder, HiOutlinePencilAlt)
• Creates a new header section with both buttons in a horizontal layout
• Uses consistent styling patterns with other interactive elements (YStack containers, hover effects, opacity transitions)
• Integrates with existing functionality: createUntitledNote() for new notes and the modal system for new directories

This refactoring follows the application's existing design patterns and maintains all original functionality while improving the logical organization of the interface. The buttons retain their original behavior but are now contextually placed where users would expect file creation actions to be.

Confidence score: 4/5

• This PR is safe to merge with minimal risk as it's a straightforward UI reorganization
• Score reflects clean refactoring with proper cleanup and consistent styling, but lacks explicit testing
• Pay attention to FileSidebar.tsx to ensure the new header doesn't affect existing layout calculations

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