fix: contributing.mdx file

[sarthakNITT]

Description

• Fixes the docs setup command in CONTRIBUTING.mdx.
• Replaces npm run start with npm run dev to correctly run Mintlify docs locally (mintlify dev) on http://localhost:3000.

Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Use npm run dev instead of npm run start to run Mintlify docs locally at http://localhost:3000. Also cleans up formatting and stabilizes a few CLI/UI tests; no functional changes.

^{Written for commit 32a1335. Summary will update on new commits.}

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[cubic-dev-ai]

No issues found across 2 files

[sarthakNITT]

I have read the CLA Document and I hereby sign the CLA

[cubic-dev-ai]

1 issue found across 37 files (changes from recent commits).

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="extensions/vscode/src/diff/vertical/handler.ts">

<violation number="1" location="extensions/vscode/src/diff/vertical/handler.ts:377">
P2: Undo-stop options are ignored—options object is not passed to `editor.edit`, so undo stops aren’t disabled.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P2: Undo-stop options are ignored—options object is not passed to editor.edit, so undo stops aren’t disabled.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At extensions/vscode/src/diff/vertical/handler.ts, line 377:

<comment>Undo-stop options are ignored—options object is not passed to `editor.edit`, so undo stops aren’t disabled.</comment>

<file context>
@@ -374,8 +374,8 @@ export class VerticalDiffHandler implements vscode.Disposable {
     await this.editor.edit((editBuilder) => {
-      editBuilder.replace(this.range, replaceContent),
-        { undoStopAfter: false, undoStopBefore: false };
+      (editBuilder.replace(this.range, replaceContent),
+        { undoStopAfter: false, undoStopBefore: false });
     });
</file context>

[RomneyDa]

@sarthakNITT looks like there's a large diff here and the described changes to contributing.mdx are just a couple lines, also it's to contributing.md I'm gonna close this to be safe, could you open another PR with the proposed changes if needed?