Fix license settings

[HZooly]

Scope

What's changed:

• Add license settings page with plan info, entitlements, add-ons, and deactivation flow
• Hide add-ons section for non-Team plans (shown only when the server returns available add-ons)
• Hide "Manage" button and Danger Zone for Core tier (identified by source === null)
• Fix expiry/renewal date rendering for unlimited licenses (expires_at = -1)
• Guard MaxCapacityAlert in Collections and Flows views so the wrapper only renders when capacity is actually exceeded
• Wire collections and flows views to the license guard (entitlement limit modal, entitlement remaining counter)
• Remove deprecated VBreadcrumb headline slots from Collections and Flows

Potential Risks / Drawbacks

• Core-tier detection relies on source === null; any future non-Core unlicensed state would also suppress the Manage button and Danger Zone
• Add-ons visibility is fully backend-driven — if the server ever returns add-ons for a non-Team plan, the section will appear

Tested Scenarios

• License page renders correctly for Core tier (no Manage button, no Danger Zone, no add-ons section)
• License page renders correctly for Team tier (Manage button present, Danger Zone present, add-ons section visible when add-ons available)
• Unlimited license (expires_at = -1) shows no expiry/renewal date
• Collections and Flows pages show the capacity alert only when at or over the limit

Review Notes / Questions

• I would like reviewers to verify the source === null heuristic covers all intended Core-tier cases and doesn't accidentally hide controls for other unlicensed states

Checklist

• Added or updated tests
• Documentation PR created here or not required
• OpenAPI package PR created here or not required

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Fixes CMS-2329

[linear-code]

CMS-2329

[robluton]

LGTM! 🎸