Onboarding: permission prompts fire on page arrival, not just Continue

Swiping past the Location/Notifications pages never triggered the system
prompts — only tapping Continue did. The prompt now fires the moment its
page comes into view (onChange(of: page)): swipe, auto-advance after a
grant, or Continue all land on the page and request the permission. Both
request methods are idempotent (already-determined → status refresh, no
duplicate alert), so replay and the auto-advance path stay clean.

FuelBoard/OnboardingView.swift

@@ -47,15 +47,25 @@ struct OnboardingView: View {
                 .padding(.horizontal, 20)
                 .padding(.bottom, 24)
         }
-        // Auto-advance once the user grants a permission — the prompt itself
-        // only fires when the Continue button is tapped (after reading the
-        // page's description), never when the page merely appears.
+        // Auto-advance once the user grants a permission.
         .onChange(of: prompter.locationGranted) { _, granted in
             if granted, page == 1 { page = 2 }
         }
         .onChange(of: prompter.notificationsGranted) { _, granted in
             if granted, page == 2 { page = 3 }
         }
+        // Fire the permission the moment its page comes into view — swiping
+        // must trigger the prompt exactly like tapping Continue does. Both
+        // request methods are idempotent: an already-determined permission
+        // just refreshes the status (no duplicate system alert), so this is
+        // safe for replay and for the auto-advance path.
+        .onChange(of: page) { _, newPage in
+            if newPage == 1 {
+                prompter.requestLocation()
+            } else if newPage == 2 {
+                prompter.requestNotifications()
+            }
+        }
         // No data-permission step: prices download from the internet (GitHub
         // mirror) with no permission at all — Local Network was removed from
         // the app when the relay left the consumer chain.
@@ -237,8 +247,9 @@ struct OnboardingView: View {
                 if prompter.locationDenied {
                     openSettings()
                 } else if !prompter.locationGranted {
-                    // The system prompt fires HERE — after the user has read
-                    // the description and tapped Continue — not on page appear.
+                    // Safety net — the prompt already fired when this page
+                    // came into view (see onChange(of: page)); re-requesting
+                    // is a no-op unless the status is still undetermined.
                     prompter.requestLocation()
                 } else {
                     page = 2