Replace oxfmt with Prettier

[JReinhold]

oxfmt isn't quite ready yet. the VSCode integration stopped working for me, which is a deal breaker.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 92399fc

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[pkg-pr-new]

npm i https://pkg.pr.new/@storybook/addon-mcp@68

npm i https://pkg.pr.new/@storybook/mcp@68

commit: 92399fc

[codecov]

Bundle Report

Bundle size has no change ✅

[Copilot]

Pull Request Overview

This PR replaces oxfmt with Prettier as the code formatter for the repository due to VSCode integration issues with oxfmt.

• Switches from oxfmt to Prettier for code formatting
• Updates configuration files and documentation to reflect the change
• Applies Prettier formatting to existing files (whitespace/formatting changes only)

Reviewed Changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Replaces oxfmt dependency with prettier and updates format script
.prettierrc	Adds Prettier configuration with tabs, single quotes, and trailing commas
.oxfmtrc.json	Removes oxfmt configuration file
.vscode/settings.json	Updates default formatter from oxc-vscode to prettier-vscode
.github/instructions/mcp.instructions.md	Updates documentation to reference Prettier instead of oxfmt
.github/instructions/addon-mcp.instructions.md	Updates documentation to reference Prettier instead of oxfmt
packages/addon-mcp/CHANGELOG.md	Applies Prettier formatting (removes trailing blank lines)
apps/internal-storybook/tsconfig.json	Applies Prettier formatting (removes trailing comma)
.changeset/pre.json	Applies Prettier formatting (tabs and indentation)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.63%. Comparing base (6fd9b5d) to head (92399fc).
⚠️ Report is 1 commits behind head on next.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             next      #68   +/-   ##
=======================================
  Coverage   82.63%   82.63%           
=======================================
  Files          15       15           
  Lines         841      841           
  Branches      162      162           
=======================================
  Hits          695      695           
  Misses        138      138           
  Partials        8        8           

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