fix(referral): show correct status for pending referral reward

[PanAchy]

Issue for this PR

Closes #28713

Type of change

• Bug fix

What does this PR do?

The referral rewards UI showed "Subscribe to unlock" for two different situations:

1. The referrer is not subscribed to Go — they need to subscribe (correct)
2. The referrer is subscribed but their friend hasn't subscribed yet — "Subscribe to unlock" is wrong here, the referrer has already subscribed

This PR adds a separate i18n key for the pending-but-subscribed state, so the label correctly reads "Waiting for referral to subscribe" when the referrer is subscribed and the reward is pending.

Before:

function rewardActionKey(reward, hasActiveGo) {
  if (reward.status === "pending" || !hasActiveGo)
    return "workspace.referral.reward.action.subscribeUnlock";
  // ...
}

After:

function rewardActionKey(reward, hasActiveGo) {
  if (reward.status === "pending" && hasActiveGo)
    return "workspace.referral.reward.action.pendingFriendSubscription";
  if (!hasActiveGo) return "workspace.referral.reward.action.subscribeUnlock";
  // ...
}

The button remains disabled for pending rewards. Only the label changes.

Files changed:

• packages/console/app/src/component/go-referral.tsx — updated rewardActionKey logic
• packages/console/app/src/component/go-referral.reward-action.ts — new action key constant
• packages/console/app/src/i18n/en.ts — new label string

How did you verify your code works?

• Ran bun test in packages/console/app — 7 tests pass, 0 fail.
• Ran bun typecheck in packages/console/app — no errors.
• Confirmed the button disabled condition (reward.status !== "available" || !props.lite) is unchanged — pending rewards remain unclickable.
• Confirmed the "Subscribe to unlock" label still appears correctly for non-subscribed users.

Screenshots / recordings

If this is a UI change, please include a screenshot or recording.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR