feat: auto-subscribe push on login, better push logging

- Auto-subscribe to push on login, register, and session restore
- Guard against nil db in SendChannelNotification
- Log push send count per channel message
- Bump SW cache to v5

web/src/stores/auth.ts

@@ -71,6 +71,16 @@ interface AuthState {
   clearError: () => void;
 }
 
+// ponytail: auto-subscribe to push notifications on auth
+function autoSubscribePush() {
+  import("../stores/push.ts").then(({ usePushStore }) => {
+    const ps = usePushStore.getState();
+    if (ps.isSupported && Notification.permission !== 'denied' && !ps.isSubscribed) {
+      ps.subscribe();
+    }
+  });
+}
+
 export const useAuthStore = create<AuthState>((set) => ({
   user: null,
   isAuthenticated: false,
@@ -86,6 +96,7 @@ export const useAuthStore = create<AuthState>((set) => ({
       });
       const user = await api.get<User>("/auth/me");
       set({ user, isAuthenticated: true, isLoading: false });
+      autoSubscribePush();
     } catch (error) {
       set({
         isLoading: false,
@@ -106,6 +117,7 @@ export const useAuthStore = create<AuthState>((set) => ({
       });
       const user = await api.get<User>("/auth/me");
       set({ user, isAuthenticated: true, isLoading: false });
+      autoSubscribePush();
     } catch (error) {
       set({
         isLoading: false,
@@ -135,6 +147,7 @@ export const useAuthStore = create<AuthState>((set) => ({
     try {
       const user = await api.get<User>(`/auth/me?t=${Date.now()}`);
       set({ user, isAuthenticated: true, isLoading: false });
+      autoSubscribePush();
     } catch (error) {
       set({
         user: null,