Add the code editor

[SharonStrats]

Moved the code editor from source pane so it can be used in other panes.

[Copilot]

Pull request overview

Introduces a reusable CodeEditor utility (based on CodeMirror 6) and exposes it from the library’s public entrypoint so it can be used across panes instead of being tied to a single pane implementation.

Changes:

• Added a new CodeEditor class with initialization, content replacement, read-only toggling, language switching, and dirty-state tracking.
• Exported the new module via src/lib/code-editor and re-exported it from src/index.ts.
• Added CodeMirror-related runtime dependencies and a unit test covering basic initialization and operations.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/unit/codeEditor.test.js	Adds unit tests and CodeMirror mocks for the new CodeEditor.
src/lib/code-editor/index.ts	Public barrel export for the code editor module.
src/lib/code-editor/CodeEditor.ts	Implements the reusable CodeMirror-backed CodeEditor class.
src/index.ts	Re-exports lib/code-editor from the package entrypoint.
package.json	Bumps package version and adds CodeMirror/theme dependencies.
package-lock.json	Locks newly added CodeMirror/theme dependency tree.

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