feat(usage): show and redeem free limit resets for cc accounts

Adds the free usage-limit reset (the desktop app's "Reset for free")
to the Quota Tracker for cc OAuth accounts, mirroring the existing
Codex reset-credit button.

- Reset button with remaining count on the card; tooltip shows use-by
  date and which limits get refilled.
- Expiry modal (clock button) listing each grant: label, resets left,
  refills (session / weekly), use-by date, time remaining, status.
- Confirm dialog before redeeming, since a reset is irreversible.
- Usage and reset calls send the CLI User-Agent required for cedar_ember.
- Usage cache is dropped after a redeem so the card shows the refilled limits.

open-sse/providers/registry/claude.js

@@ -54,6 +54,8 @@ export default {
       oauthUrl: "https://api.anthropic.com/api/oauth/usage",
       orgUrl: "https://api.anthropic.com/v1/organizations/{org_id}/usage",
       settingsUrl: "https://api.anthropic.com/v1/settings",
+      profileUrl: "https://api.anthropic.com/api/oauth/profile",
+      resetUrl: "https://api.anthropic.com/api/organizations/{org_id}/reset_rate_limits",
     },
   },
   models: [