fix(license): say a license expires rather than renews

[CREDO23]

The licence panel in Settings labelled the expiry date "Renews". Nothing
auto-renews: a licence file carries a fixed expiry date, so the label was
wrong for a trial and misleading for individual and team.

"Expires" is accurate for every plan, which keeps this a single label
rather than a branch on plan. "Ended" stays for the expired state,
where it already read correctly.

Noticed while testing the trial flow end to end against a self-hosted
Keygen CE instance: the imported trial licence showed "Renews Oct 17,
2026".

The test that asserted the old copy is updated in the same commit.
pnpm test passes (7/7 in license-settings.test.tsx).

High-level PR Summary

This PR fixes a misleading label in the license settings panel by changing "Renews" to "Expires" for active licenses. Since license files carry a fixed expiry date and nothing auto-renews, the previous label was inaccurate for trial licenses and misleading for individual and team plans. The corresponding test assertion is updated to match the new copy.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_local/frontend/src/features/license/license-settings.tsx
2	surfsense_local/frontend/src/features/license/license-settings.test.tsx

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