fix: preserve refill date slashes in subscription credits label (#9251)

### Motivation
- Subscription credit labels were rendering the refill date with
HTML-escaped separators (`/`) because `vue-i18n` parameter escaping
was applied to the date interpolation.
- The goal is to render date-only parameters like `MM/DD/YY` with
literal slashes so the UI shows a human-readable date string.

### Description
- Disabled `vue-i18n` parameter escaping for the
`subscription.creditsRemainingThisMonth` and
`subscription.creditsRemainingThisYear` lookups in both subscription
panels by passing `{ escapeParameter: false }` to `t()` in
`SubscriptionPanelContentLegacy.vue` and
`SubscriptionPanelContentWorkspace.vue`.
- Adjusted the unit test i18n setup in `SubscriptionPanel.test.ts` to
include `escapeParameter: true` in the test `i18n` instance and updated
the test messages to use `Included (Refills {date})`.
- Added a regression unit test in `SubscriptionPanel.test.ts` asserting
the rendered label contains `Included (Refills 12/31/24)` and does not
contain the escaped entity `/`.

### Testing
- Ran formatting with `pnpm format` which completed successfully.
- Ran lint via `pnpm lint` which passed with pre-existing warnings only
(no new errors).
- Ran type checking with `pnpm typecheck` (via `vue-tsc --noEmit`) which
completed successfully.
- Ran the modified unit tests with `pnpm vitest run
src/platform/cloud/subscription/components/SubscriptionPanel.test.ts`
and the test file passed (10 passed, 5 skipped).
- Attempted a Playwright-based visual capture of the running app but
Chromium crashed in this environment (SIGSEGV) before navigation, so no
screenshot was produced.

------
[Codex
Task](https://chatgpt.com/codex/tasks/task_e_69a0175f58788330b2256329a500e14b)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9251-fix-preserve-refill-date-slashes-in-subscription-credits-label-3136d73d36508182b770f5719a52d189)
by [Unito](https://www.unito.io)

src/platform/workspace/components/SubscriptionPanelContentWorkspace.vue

@@ -534,12 +534,24 @@ const refillsDate = computed(() => {
 
 const creditsRemainingLabel = computed(() =>
   isYearlySubscription.value
-    ? t('subscription.creditsRemainingThisYear', {
-        date: refillsDate.value
-      })
-    : t('subscription.creditsRemainingThisMonth', {
-        date: refillsDate.value
-      })
+    ? t(
+        'subscription.creditsRemainingThisYear',
+        {
+          date: refillsDate.value
+        },
+        {
+          escapeParameter: false
+        }
+      )
+    : t(
+        'subscription.creditsRemainingThisMonth',
+        {
+          date: refillsDate.value
+        },
+        {
+          escapeParameter: false
+        }
+      )
 )
 
 const planTotalCredits = computed(() => {