feat: improve visual selection handling in file tree buffers

[ThomasK33]

Improved Visual Selection Support for Tree Buffers

This PR enhances the file selection mechanism in tree-based file explorers (neo-tree, nvim-tree, mini.files) when using visual mode. The changes:

• Add dedicated visual selection handling for tree buffers that accurately captures files in visual selections
• Implement a fallback mechanism that tries visual selection first, then falls back to regular selection methods
• Add detailed logging for neo-tree integration to help diagnose selection issues
• Support directory nodes in visual selections for neo-tree
• Add unit tests to verify visual selection handling in tree buffers

These improvements make it more intuitive to select multiple files in file explorers using visual mode (V), similar to how neo-tree's built-in commands work with visual selections.

[ThomasK33]

• fix: improve connection reliability with better handshake detection #133
• feat: improve visual selection handling in file tree buffers #132 👈 (View in Graphite)
• main

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[ThomasK33]

Merge activity

• Sep 15, 5:27 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Sep 15, 5:27 PM UTC: @ThomasK33 merged this pull request with Graphite.