refactor: code cleanup and simplification

[xbinaryx]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

The purpose of this pull request is to improve maintainability and consistency across the codebase. It simplifies components, consolidates duplicated logic, and introduces small refactors to shared utilities and UI elements. These changes reduce complexity and make future enhancements easier.

What changes did you make? (Give an overview)

• Unified per-language AST components (javascript-ast, json-ast, css-ast, html-ast, markdown-ast) into a single generic AST component.
• Consolidated duplicated *-ast-tree-item components into a single reusable ASTTreeItem.
• Updated *-view-mode components to delegate rendering logic to a new ViewModeToggle.
• Extracted and exported new shared UI components:
  • LabeledSelect (converted to named export).
  • LabeledSwitch (new component for consistent labeled toggles).
• Updated documentation (adding-languages.md) to reflect the simplified process for adding new languages.

Related Issues

Fixes #134

Is there anything you'd like reviewers to focus on?

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[Copilot]

Pull Request Overview

This PR consolidates and simplifies the AST component architecture by unifying language-specific AST implementations into a single generic component. It introduces reusable UI components and extracts shared logic to reduce code duplication.

• Unified all per-language AST components (javascript-ast, json-ast, css-ast, html-ast, markdown-ast) into a single generic AST component
• Consolidated duplicate *-ast-tree-item components into a single reusable ASTTreeItem
• Extracted view mode toggle logic into a reusable ViewModeToggle component and created LabeledSwitch for consistent UI patterns

Reviewed Changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/lib/tools.tsx	Updates import to use the new unified AST component
src/components/view-mode-toggle.tsx	New reusable component for view mode toggles
src/components/theme-provider.tsx	Fixes relative import path
src/components/scope/scope-view-mode.tsx	Refactored to use the new ViewModeToggle component
src/components/path/path-view-mode.tsx	Refactored to use the new ViewModeToggle component
src/components/path/index.tsx	Refactored to use shared ErrorState component
src/components/options.tsx	Refactored to use new LabeledSwitch component and updated imports
src/components/labeled-switch.tsx	New reusable component for labeled switches
src/components/labeled-select.tsx	Converted from default to named export
src/components/ast/markdown-ast.tsx	Removed - consolidated into generic AST component
src/components/ast/markdown-ast-tree-item.tsx	Removed - consolidated into generic ASTTreeItem
src/components/ast/json-ast.tsx	Removed - consolidated into generic AST component
src/components/ast/json-ast-tree-item.tsx	Removed - consolidated into generic ASTTreeItem
src/components/ast/javascript-ast.tsx	Removed - consolidated into generic AST component
src/components/ast/javascript-ast-tree-item.tsx	Removed - consolidated into generic ASTTreeItem
src/components/ast/index.tsx	Rewritten to implement the unified AST component
src/components/ast/html-ast.tsx	Removed - consolidated into generic AST component
src/components/ast/html-ast-tree-item.tsx	Removed - consolidated into generic ASTTreeItem
src/components/ast/css-ast.tsx	Removed - consolidated into generic AST component
src/components/ast/ast-view-mode.tsx	Refactored to use the new ViewModeToggle component
src/components/ast/ast-tree-item.tsx	Renamed and made generic to replace all language-specific tree items
docs/adding-languages.md	Updated documentation to reflect simplified language addition process

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