Revert "Migrate file tree creation to Rust backend"

[Keshav-writes-code]

Reverts #6

[Copilot]

Pull request overview

This PR reverts PR #6, which had migrated file tree creation from a TypeScript/JavaScript implementation to a Rust backend. The revert restores the original JavaScript-based file tree building logic and removes the Rust implementation.

Key changes:

• Restored TypeScript file tree building functions (build_file_tree_from_fs, transform_entries_to_filenode, transform_android_entries_to_filenode)
• Removed Rust file tree implementation and the build_file_tree Tauri command
• Cleaned up unused Rust dependencies (urlencoding and futures)

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
apps/app/src/lib/file_tree/builder.ts	Restored complete TypeScript file tree building implementation with platform-specific logic for Android and desktop
apps/app/src/lib/file_tree/utils/file_tree_utils.ts	Removed blank lines (whitespace cleanup)
apps/app/src/components/sidebar/file_manager/items_renderer.svelte	Minor whitespace change on class attribute
apps/app/src/components/sidebar/file_manager/index.svelte	Removed blank line (whitespace cleanup)
apps/app/src-tauri/src/lib.rs	Removed entire Rust file tree implementation including FileNode struct, recursive building functions, and Tauri command handler
apps/app/src-tauri/Cargo.toml	Removed urlencoding and futures dependencies no longer needed
apps/app/src-tauri/Cargo.lock	Updated lock file to reflect removed direct dependencies (transitive dependencies remain)

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Suggested change

	class="{opened_filenode?.path === node.path ? 'bg-base-content/10' : ''}
	class="{opened_filenode?.path === node.path ? 'bg-base-content/10' : ''}