refactor(usage): keep the section titles with the rest of the copy

Two were still inline while their siblings sat in COPY, which made the
block look like it held some of the prose rather than all of it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: talissoncosta

frontend/web/components/pages/usage/copy.ts

@@ -29,12 +29,14 @@ const COPY = {
     'We are unable to show exact billing periods for your subscription plan.',
   noPlanLimit: 'This installation has no plan limit.',
   overLimitTitle: 'Your organisation has exceeded its plan limit',
+  planTitle: 'Your plan',
   // Says access, not flags: the API does not expose stop_serving_flags.
   recovery:
     'Upgrading restores access straight away. Otherwise access returns once' +
     ' your usage has stayed under the limit for 30 days.',
   restrictedTitle: 'Your organisation is restricted',
   staysVisible: 'Your usage stays visible below so you can see what happened.',
+  usageTitle: 'Your usage',
 }
 
 export type BannerContext = {
@@ -79,7 +81,7 @@ export const planSectionCopy = (
   if (!limit) {
     return {
       hint: sentences(`API calls over ${window}.`, COPY.noPlanLimit),
-      title: 'Your usage',
+      title: COPY.usageTitle,
     }
   }
 
@@ -90,7 +92,7 @@ export const planSectionCopy = (
         basis.reason === 'no-period' &&
         COPY.noBillingPeriod,
     ),
-    title: 'Your plan',
+    title: COPY.planTitle,
   }
 }