[6.x] Port settings/sites to inertia

[brianjhanson]

Refactors the settings/sites page into Inertia.

CleanShot.2026-01-06.at.14.57.55.mp4

[juice928]

👋 Hi, I'm an automated AI code review bot. I ran some checks on this PR and found 3 points that might be worth attention (could be false positives, please use your judgment):

1. Improvement for ID generation to ensure better accessibility

   • Location: packages/craftcms-cp/src/components/nav-item/nav-item.ts:L105-L108
   • Impact: If an ID isn't provided, multiple components might end up with the same fallback ID, which can interfere with screen readers.
   • Suggestion: Consider adding a fallback mechanism to generate a unique ID so every element remains distinct and accessible.

2. Enhancing slot detection to be more reactive

   • Location: packages/craftcms-cp/src/components/nav-item/nav-item.ts:L142-L146
   • Impact: Synchronous DOM checks might not catch dynamic content updates, which could lead to an inconsistent UI state.
   • Suggestion: You might find that using slotchange events or a observer helps the component react more smoothly to dynamic changes.

3. Refining CSS selectors to maintain consistent styling

   • Location: packages/craftcms-cp/src/styles/shared/base.css:L43
   • Impact: Changing from a tag selector to a class-based one might cause standard code tags to lose their intended padding and background.
   • Suggestion: It might be safer to keep the global tag selector or verify that all instances of code elements have been updated to the new class.

If you find these suggestions disruptive, you can reply "stop" , and I'll automatically skip this repository in the future.