Add trial days remaining to billing card, 5-min polling, and wire upgrade button

- Add trialDaysRemaining to IPC schema, useBilling hook, and BillingInfo interface
- Show trial countdown in sidebar billing card (e.g. "7 days left on trial")
- Add 5-minute polling interval for billing data refresh
- Wire Upgrade button to open web billing page in system browser

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/x/apps/renderer/src/components/sidebar-content.tsx

@@ -405,6 +405,7 @@ export function SidebarContentPanel({
   const connectorsButtonRef = useRef<HTMLButtonElement | null>(null)
   const [isRowboatConnected, setIsRowboatConnected] = useState(false)
   const [loggingIn, setLoggingIn] = useState(false)
+  const [appUrl, setAppUrl] = useState<string | null>(null)
   const { billing } = useBilling(isRowboatConnected)
 
   const handleRowboatLogin = useCallback(async () => {
@@ -427,13 +428,20 @@ export function SidebarContentPanel({
         const result = await window.ipc.invoke('oauth:getState', null)
         const config = result.config || {}
         const hasError = Object.values(config).some((entry) => Boolean(entry?.error))
+        const connected = config['rowboat']?.connected ?? false
         if (mounted) {
           setHasOauthError(hasError)
-          setIsRowboatConnected(config['rowboat']?.connected ?? false)
+          setIsRowboatConnected(connected)
           if (!hasError) {
             setShowOauthAlert(true)
           }
         }
+        if (connected && mounted) {
+          try {
+            const account = await window.ipc.invoke('account:getRowboat', null)
+            if (mounted) setAppUrl(account.config?.appUrl ?? null)
+          } catch { /* ignore */ }
+        }
       } catch (error) {
         console.error('Failed to fetch OAuth state:', error)
         if (mounted) {
@@ -507,10 +515,22 @@ export function SidebarContentPanel({
       {isRowboatConnected && billing ? (
         <div className="px-3 py-2">
           <div className="flex items-center justify-between rounded-lg border border-sidebar-border bg-sidebar-accent/20 px-3 py-2">
-            <span className="text-xs font-medium capitalize text-sidebar-foreground">
-              {billing.subscriptionPlan ?? 'Free'} plan
-            </span>
-            <button className="rounded-md bg-sidebar-foreground/10 px-2.5 py-1 text-[11px] font-medium text-sidebar-foreground transition-colors hover:bg-sidebar-foreground/20">
+            <div className="flex flex-col gap-0.5">
+              <span className="text-xs font-medium capitalize text-sidebar-foreground">
+                {billing.subscriptionPlan ?? 'Free'} plan
+              </span>
+              {billing.subscriptionStatus === 'trialing' && billing.trialDaysRemaining != null && (
+                <span className="text-[10px] text-sidebar-foreground/60">
+                  {billing.trialDaysRemaining === 0
+                    ? 'Trial ends today'
+                    : `${billing.trialDaysRemaining} day${billing.trialDaysRemaining === 1 ? '' : 's'} left on trial`}
+                </span>
+              )}
+            </div>
+            <button
+              onClick={() => appUrl && window.open(appUrl)}
+              className="rounded-md bg-sidebar-foreground/10 px-2.5 py-1 text-[11px] font-medium text-sidebar-foreground transition-colors hover:bg-sidebar-foreground/20"
+            >
               Upgrade
             </button>
           </div>

apps/x/apps/renderer/src/hooks/useBilling.ts

@@ -1,17 +1,21 @@
-import { useState, useEffect, useCallback } from 'react'
+import { useState, useEffect, useCallback, useRef } from 'react'
 
 interface BillingInfo {
   userEmail: string | null
   userId: string | null
   subscriptionPlan: string | null
   subscriptionStatus: string | null
+  trialDaysRemaining: number | null
   sanctionedCredits: number
   availableCredits: number
 }
 
+const POLLING_INTERVAL_MS = 5 * 60 * 1000 // 5 minutes
+
 export function useBilling(isRowboatConnected: boolean) {
   const [billing, setBilling] = useState<BillingInfo | null>(null)
   const [isLoading, setIsLoading] = useState(false)
+  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null)
 
   const fetchBilling = useCallback(async () => {
     if (!isRowboatConnected) {
@@ -32,7 +36,23 @@ export function useBilling(isRowboatConnected: boolean) {
 
   useEffect(() => {
     fetchBilling()
-  }, [fetchBilling])
+
+    if (intervalRef.current) {
+      clearInterval(intervalRef.current)
+      intervalRef.current = null
+    }
+
+    if (isRowboatConnected) {
+      intervalRef.current = setInterval(fetchBilling, POLLING_INTERVAL_MS)
+    }
+
+    return () => {
+      if (intervalRef.current) {
+        clearInterval(intervalRef.current)
+        intervalRef.current = null
+      }
+    }
+  }, [fetchBilling, isRowboatConnected])
 
   return { billing, isLoading, refresh: fetchBilling }
 }

apps/x/packages/core/src/billing/billing.ts

@@ -6,6 +6,7 @@ export interface BillingInfo {
   userId: string | null;
   subscriptionPlan: string | null;
   subscriptionStatus: string | null;
+  trialDaysRemaining: number | null;
   sanctionedCredits: number;
   availableCredits: number;
 }
@@ -26,6 +27,7 @@ export async function getBillingInfo(): Promise<BillingInfo> {
     billing: {
       plan: string | null;
       status: string | null;
+      trialDaysRemaining: number | null;
       usage: {
         sanctionedCredits: number;
         availableCredits: number;
@@ -37,6 +39,7 @@ export async function getBillingInfo(): Promise<BillingInfo> {
     userId: body.user.id ?? null,
     subscriptionPlan: body.billing.plan,
     subscriptionStatus: body.billing.status,
+    trialDaysRemaining: body.billing.trialDaysRemaining ?? null,
     sanctionedCredits: body.billing.usage.sanctionedCredits,
     availableCredits: body.billing.usage.availableCredits,
   };

apps/x/packages/shared/src/ipc.ts

@@ -564,6 +564,7 @@ const ipcSchemas = {
       userId: z.string().nullable(),
       subscriptionPlan: z.string().nullable(),
       subscriptionStatus: z.string().nullable(),
+      trialDaysRemaining: z.number().nullable(),
       sanctionedCredits: z.number(),
       availableCredits: z.number(),
     }),