[nfebe]

Move plan management into Settings while preserving checkout and portal returns.

[sourceant]

Code Review Summary

The standalone billing page is replaced by a Plan and billing tab rendered by a new settings component, with /billing redirecting into it while preserving query parameters so checkout and portal returns still land. The tab adds plan status chips, a percentage usage meter, plan-derived region options, dynamic trial copy, and dismissable checkout notices. Backend integration metadata now contributes a settings tab instead of a sidebar entry.

🚀 Key Improvements

• Billing is reachable inside Settings without losing checkout/portal return state via redirect.
• Region and trial copy derive from the plans API instead of hardcoded values.
• Plan status, limits and usage are covered by new component and logic tests.

💡 Minor Suggestions

• loadError is only rendered when status is null, so a failed refresh (the notice's Refresh status button) sets loadError but shows the user nothing while stale data stays on screen. Surface it through the existing error notice when data is already loaded.

[sourceant]

Review complete. See the overview comment for a summary.

[sourceant]

loadError is only rendered when status is null, so a failed refresh (the notice's Refresh status button) sets loadError but shows the user nothing while stale data stays on screen. Surface it through the existing error notice when data is already loaded.

Suggested change

	} catch (e) {
	} catch (e) {
	loadError.value = extractApiErrors(e);
	if (status.value) actionError.value = loadError.value;
	} finally {