Rename Assistant tab to Studio Code

[sejas]

Related issues

• Related to p1780926766083729/1780924859.254889-slack-C06DRMD6VPZ

How AI was used in this PR

Used AI to apply the label rename and update the affected unit test.

Proposed Changes

• Renames the site content tab previously labeled Assistant to Studio Code, giving the AI feature a clearer, product-aligned name. Users now see "Studio Code" in the tab bar where they previously saw "Assistant".

Testing Instructions

• Open a site in Studio.
• Confirm the tab in the content area reads Studio Code instead of Assistant.
• Confirm the tab still opens the same panel and works as before.

Before	After

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[wpmobilebot]

📊 Performance Test Results

Comparing 293ae9d vs trunk

app-size

Metric	trunk	293ae9d	Diff	Change
App Size (Mac)	1310.57 MB	1310.57 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	293ae9d	Diff	Change
load	1664 ms	1640 ms	24 ms	⚪ 0.0%

site-startup

Metric	trunk	293ae9d	Diff	Change
siteCreation	9041 ms	9059 ms	+18 ms	⚪ 0.0%
siteStartup	4416 ms	4416 ms	0 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[wojtekn]

The code change looks good.

We can also look into the code and change the productDescription, a few docblock comments, OnboardingConnectToWpcom, maybe "AI Assistant" in settings.

[sejas]

I'll create a follow-up PR updating the docs, and other references. Thanks for the suggestion!