fix: improve accessible labels for CodeMirror views

[Pixel998]

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AI acknowledgment

• I did not use AI to generate this PR.
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What is the purpose of this pull request?

This PR fixes how accessible labels are applied to our CodeMirror views. It moves the label to the actual editable element and gives each editor surface a clearer accessible name.

What changes did you make? (Give an overview)

• Moved the editor accessible name onto CodeMirror's editable content using EditorView.contentAttributes.
• Removed the wrapper-level aria-label usage from the CodeMirror component call site.
• Added explicit labels for each editor instance so the main source editor, AST JSON view, and code path view are announced distinctly.

Related Issues

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[Copilot]

Pull request overview

This PR improves accessibility for CodeMirror-based editors by ensuring the accessible name is applied to the actual editable surface and by providing distinct labels for different editor instances.

Changes:

• Add an ariaLabel prop to the shared Editor component and apply it via EditorView.contentAttributes to the editable content element.
• Remove the wrapper-level aria-label from the CodeMirror component usage.
• Provide explicit, distinct accessible labels for the main code editor, AST JSON view, and code path view.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/components/editor.tsx	Introduces required ariaLabel prop and applies it to CodeMirror’s editable content via contentAttributes; removes wrapper aria-label.
src/app.tsx	Supplies ariaLabel="Code Editor" to the primary editor instance.
src/components/ast/index.tsx	Supplies ariaLabel="AST JSON" for the AST JSON editor view.
src/components/path/index.tsx	Supplies ariaLabel="Code Path" for the code-path text view.

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