chore(webapp): reword the no-billing-limit banner copy (#4656)

<!-- ccr-slack-attribution -->
_Requested by **Matt Aitken** · [Slack
thread](https://triggerdotdev.slack.com/archives/C0BKB98B84W/p1787045331358929)_

Copy-only reword of the banner shown to org admins who have not set a
billing limit yet.

**Before** — the banner read "Protect your organization from unexpected
usage spikes." with a button labelled "Configure billing limit".

**After** — it reads "Add a billing limit to your account to prevent
overspending" with a button labelled "Billing limit settings".

The new wording names the action up front and matches the destination it
sends you to, so the banner reads as a settings link rather than a
one-off setup step.

## ✅ Checklist

- [x] I have followed every step in the [contributing
guide](https://github.com/triggerdotdev/trigger.dev/blob/main/CONTRIBUTING.md)
- [x] The PR title follows the convention.
- [x] I ran and tested the code works

---

## Testing

Formatting and linting pass (`oxfmt --check`, `oxlint`). No tests or
snapshots assert this copy. The change is two string literals in one
component, with no behaviour attached.

---

## Changelog

Reworded the billing-limit banner for organizations without a limit
configured, and relabelled its button to "Billing limit settings".

---

## How

Both strings live in `NoLimitConfiguredBanner` in
`apps/webapp/app/components/billing/OrgBanner.tsx`: the heading is the
`canManageBillingLimits` branch of the banner's children, and the label
is the `<span>` inside the `LinkButton`. Only those two literals
changed. The button still points at `v3BillingLimitsPath(organization)`
(`/orgs/{slug}/settings/billing-limits`), so routing, permissions and
the non-admin variant of the message are untouched.

Co-authored-by: Claude <noreply@anthropic.com>

apps/webapp/app/components/billing/OrgBanner.tsx

@@ -157,14 +157,14 @@ function NoLimitConfiguredBanner() {
             to={v3BillingLimitsPath(organization)}
           >
             <span className="mx-auto grow self-center truncate text-text-bright system:text-white">
-              Configure billing limit
+              Billing limit settings
             </span>
           </LinkButton>
         ) : undefined
       }
     >
       {canManageBillingLimits
-        ? "Protect your organization from unexpected usage spikes."
+        ? "Add a billing limit to your account to prevent overspending"
         : "Billing limits are not configured for this organization. Contact an organization administrator to configure them."}
     </AnimatedOrgBannerBar>
   );