Compress AI settings page above the fold by reducing general settings…

[dilipom13]

Fixes #451

What changed

• Reduced the top-of-page footprint by removing the large General Settings card layout.
• Surfaced the global “Enable AI” control in a compact top area.
• Kept the explanatory text accessible in a compact help/info treatment.

Why

The previous General Settings section pushed Features and Experiments too far below the fold. This update prioritises feature visibility while preserving global AI control.

Test plan

• Visit Settings > AI and confirm Features/Experiments are visible higher on initial load
• Toggle global AI off/on and confirm snackbar messages appear
• Confirm feature toggles are disabled when global AI is off
• Confirm no regression in connector notice behaviour.

[github-actions]

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Co-authored-by: dilipom13 <dilip2615@git.wordpress.org>
Co-authored-by: Adi-ty <iamadisingh@git.wordpress.org>
Co-authored-by: dkotter <dkotter@git.wordpress.org>
Co-authored-by: mirka <0mirka00@git.wordpress.org>
Co-authored-by: jeffpaul <jeffpaul@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.07%. Comparing base (1a55305) to head (22cb7c6).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #474   +/-   ##
==========================================
  Coverage      69.07%   69.07%           
  Complexity       957      957           
==========================================
  Files             60       60           
  Lines           4511     4511           
==========================================
  Hits            3116     3116           
  Misses          1395     1395           

Flag	Coverage Δ
unit	69.07% <ø> (ø)

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[dilipom13]

Looks like the E2E job was cancelled (The operation was canceled).
I don’t have permission to re-run workflows from my account. Could a maintainer please re-run the failed/cancelled job?