docs: update billing and dashboard documentation to reflect subscription upgrade process

Author: hannesrudolph

docs/roo-code-cloud/billing-subscriptions.mdx

@@ -43,13 +43,13 @@ Free 14-day trial, then $20/month. Cancel anytime.
 
 ## Getting Started with Pro
 
-### Step 1: Access Billing
+### Step 1: Access Upgrade
 
-Navigate to your billing page:
-- Go to [app.roocode.com/billing](https://app.roocode.com/billing)
-- Or click **Billing** from your dashboard
+<img src="/img/billing-subscriptions/billing-subscriptions-1.png" alt="Upgrade page showing Start Trial for Pro" width="600" />
 
-<img src="/img/billing-subscriptions/billing-subscriptions-1.png" alt="Billing page showing Start Trial for Pro" width="800" />
+Open the Upgrade page (for non-subscribers):
+- Go to [app.roocode.com/billing](https://app.roocode.com/billing)
+- Or click **Upgrade** from your dashboard
 
 
 ### Step 2: Subscribe to Pro

docs/roo-code-cloud/dashboard.mdx

@@ -74,15 +74,26 @@ The Usage Analytics page provides:
   - Total tokens consumed
   - Total estimated cost
 
-### Billing Page
+### Upgrade Page (before subscribing)
 
-Manage your subscription by clicking the **Billing** tab or navigate directly to [app.roocode.com/billing](https://app.roocode.com/billing).
+Start your subscription from the **Upgrade** tab or navigate to [app.roocode.com/billing](https://app.roocode.com/billing).
 
-<img src="/img/dashboard/dashboard-2.png" alt="Billing page showing Start Trial for Pro" width="800" />
+<img src="/img/billing-subscriptions/billing-subscriptions-1.png" alt="Upgrade page showing Start Trial for Pro" width="800" />
 
-The Billing page displays:
+This page shows:
 - Upgrade to Roo Code Cloud Pro card
 - Free for 14 days, then $20/month
 - Start Trial button
 
+### Billing Page (after subscribing)
+
+After subscribing, the **Upgrade** tab is replaced by **Billing**. Manage your plan and access invoices at [app.roocode.com/billing](https://app.roocode.com/billing).
+
+<img src="/img/billing-subscriptions/billing-subscriptions-2.png" alt="Billing page with active Pro plan and Manage Subscriptions" width="800" />
+
+From this page you can:
+- View Pro Plan status and renewal date
+- Confirm $20/month amount
+- Open the Stripe customer portal via Manage Subscriptions
+
 See the [Billing & Subscriptions](/roo-code-cloud/billing-subscriptions) documentation for complete details.