feat(app): auto-retry every remaining try?-swallowed API call, add repeated-failure banner

Second half of the silent-failure fix - OutlineKit's RetryPolicy and
CachingOutlineAPIClient tracking landed in 512c6d2, this wires the
rest of the app onto it.

Every bare `try? await apiClient.X(...)` that bypasses
CachingOutlineAPIClient's own caching (listPins, listSubscriptions,
listViews, listStars, documentUsers, listUsers, listComments,
currentUser, installationInfo, authInfo, deleteAttachment - the
"pass-through" methods) now goes through RetryPolicy.withRetry first,
so a single transient blip gets absorbed automatically instead of
just returning nil. Calls that were already routed through
CachingOutlineAPIClient's cached-read path (documentInfo,
listDocuments, listCollections, etc.) are left alone - they picked up
retry and repeated-failure tracking for free from the previous commit
and wrapping them again would've just retried twice.

New: APIFailureCenter (Root/) turns CachingOutlineAPIClient's
repeatedFailureSummaries() into a banner - RootView polls it every
30s while signed in (cheap, no network call of its own) and shows
RepeatedFailureBanner for whichever category is currently past the
threshold. No manual "Retry" button - the retries already happened
automatically before the banner ever appears, so the only actions are
Report (opens a prefilled Gitea issue - category, generic error
description, app/OS version, no document content or server URL) and
dismiss, which starts a 15-minute cooldown so a still-flaky operation
doesn't immediately pop the same banner back up.

Not compiler-verified - the Outpost app target has no CLI build path,
only OutlineKit does (92/92 passing as of the previous commit, no
OutlineKit changes here).

Outpost/Features/Account/SettingsSidebarList.swift

@@ -125,7 +125,7 @@ struct SettingsSidebarList: View {
 
     private func refreshOutlineVersion() async {
         guard isEffectivelyOnline, let apiClient = session.apiClient else { return }
-        outlineVersion = try? await apiClient.installationInfo().version
+        outlineVersion = try? await RetryPolicy.withRetry({ try await apiClient.installationInfo().version })
     }
 }
 #endif

Outpost/Features/Account/SettingsView.swift

@@ -1511,7 +1511,7 @@ struct SettingsView: View {
 
     private func refreshProfile() async {
         guard let apiClient = session.apiClient else { return }
-        guard let fresh = try? await apiClient.currentUser() else { return }
+        guard let fresh = try? await RetryPolicy.withRetry({ try await apiClient.currentUser() }) else { return }
         session.applyUpdatedProfile(fresh)
     }
 
@@ -1543,7 +1543,7 @@ struct SettingsView: View {
             // Best-effort — the new avatar is already live either way, this
             // just stops the old upload from sitting around unreferenced.
             if let previousAttachmentId {
-                try? await apiClient.deleteAttachment(id: previousAttachmentId)
+                try? await RetryPolicy.withRetry({ try await apiClient.deleteAttachment(id: previousAttachmentId) })
             }
         } catch {
             avatarErrorMessage = outlineErrorMessage(error, fallback: "Couldn't upload this photo.")
@@ -1560,7 +1560,7 @@ struct SettingsView: View {
             session.applyUpdatedProfile(updated)
             avatarErrorMessage = nil
             if let previousAttachmentId {
-                try? await apiClient.deleteAttachment(id: previousAttachmentId)
+                try? await RetryPolicy.withRetry({ try await apiClient.deleteAttachment(id: previousAttachmentId) })
             }
         } catch {
             avatarErrorMessage = outlineErrorMessage(error, fallback: "Couldn't remove this photo.")

Outpost/Features/Collections/CollectionDocumentsOutline.swift

@@ -90,7 +90,7 @@ struct CollectionDocumentsOutline: View {
     }
 
     private func loadPins() async {
-        guard let pins = try? await apiClient.listPins(ListPinsRequest(collectionId: collection.id)) else { return }
+        guard let pins = try? await RetryPolicy.withRetry({ try await apiClient.listPins(ListPinsRequest(collectionId: collection.id)) }) else { return }
         pinsByDocumentID = Dictionary(uniqueKeysWithValues: pins.map { ($0.documentId, $0) })
     }
 }

Outpost/Features/Collections/DocumentCommentsSheet.swift

@@ -123,7 +123,7 @@ struct DocumentCommentsSheet: View {
         }
         .frame(width: 480, height: 560)
         .task { await load() }
-        .task { currentUserId = try? await apiClient.currentUser().id }
+        .task { currentUserId = try? await RetryPolicy.withRetry({ try await apiClient.currentUser().id }) }
         .task { composingAnchorText = pendingAnchorText }
         .alert("Couldn't Complete Action", isPresented: .constant(actionErrorMessage != nil)) {
             Button("OK") { actionErrorMessage = nil }

Outpost/Features/Collections/DocumentReaderView.swift

@@ -328,9 +328,11 @@ struct DocumentReaderView: View {
             await viewModel.loadInsightsEnabledState()
         }
         .task {
-            loadedComments = (try? await apiClient.listComments(
+            loadedComments = (try? await RetryPolicy.withRetry({
+                try await apiClient.listComments(
                     ListCommentsRequest(documentId: viewModel.documentId, includeAnchorText: true)
-            )) ?? []
+                )
+            })) ?? []
         }
         .task {
             while !Task.isCancelled {
@@ -387,9 +389,11 @@ struct DocumentReaderView: View {
                 pendingAnchorText: pendingCommentAnchorText,
                 onCommentsChanged: {
                     Task {
-                        loadedComments = (try? await apiClient.listComments(
+                        loadedComments = (try? await RetryPolicy.withRetry({
+                            try await apiClient.listComments(
                                 ListCommentsRequest(documentId: viewModel.documentId, includeAnchorText: true)
-                        )) ?? loadedComments
+                            )
+                        })) ?? loadedComments
                     }
                 }
             )

Outpost/Features/Collections/DocumentReaderViewModel.swift

@@ -111,14 +111,18 @@ final class DocumentReaderViewModel {
     }
 
     func loadViewers() async {
-        guard let views = try? await apiClient.listViews(ListViewsRequest(documentId: documentId)) else { return }
+        // A single blip here used to just leave `viewers` empty forever with
+        // no sign anything went wrong — retry-with-backoff absorbs that;
+        // `try?` still covers the "still failing after retries" case, same
+        // silent-but-harmless fallback as before (an empty viewers list).
+        guard let views = try? await RetryPolicy.withRetry({ try await apiClient.listViews(ListViewsRequest(documentId: documentId)) }) else { return }
         viewers = views.filter { $0.lastViewedAt != nil }
     }
 
     func loadPinAndSubscriptionState() async {
         // `collectionId: nil` = Home pins. This menu's Pin action is "Pin to
         // Home", not "Pin to Collection" — those are distinct on the server.
-        if let pins = try? await apiClient.listPins(ListPinsRequest(collectionId: nil)),
+        if let pins = try? await RetryPolicy.withRetry({ try await apiClient.listPins(ListPinsRequest(collectionId: nil)) }),
            let match = pins.first(where: { $0.documentId == documentId }) {
             isPinned = true
             pinId = match.id
@@ -127,7 +131,7 @@ final class DocumentReaderViewModel {
             pinId = nil
         }
 
-        if let subscriptions = try? await apiClient.listSubscriptions(ListSubscriptionsRequest(documentId: documentId)),
+        if let subscriptions = try? await RetryPolicy.withRetry({ try await apiClient.listSubscriptions(ListSubscriptionsRequest(documentId: documentId)) }),
            let match = subscriptions.first {
             isSubscribed = true
             subscriptionId = match.id

Outpost/Features/Collections/DocumentShareSheet.swift

@@ -370,7 +370,7 @@ struct DocumentShareSheet: View {
     private func loadMembers() async {
         isLoadingMembers = true
         defer { isLoadingMembers = false }
-        members = (try? await apiClient.documentUsers(ListDocumentUsersRequest(id: documentId))) ?? []
+        members = (try? await RetryPolicy.withRetry({ try await apiClient.documentUsers(ListDocumentUsersRequest(id: documentId)) })) ?? []
     }
 
     private func searchUsers(_ query: String) async {
@@ -381,7 +381,7 @@ struct DocumentShareSheet: View {
         }
         isSearchingUsers = true
         defer { isSearchingUsers = false }
-        userSearchResults = (try? await apiClient.listUsers(ListUsersRequest(query: trimmed))) ?? []
+        userSearchResults = (try? await RetryPolicy.withRetry({ try await apiClient.listUsers(ListUsersRequest(query: trimmed)) })) ?? []
     }
 
     private func addUser(_ user: OutlineUser) async {

Outpost/Features/Home/HomeViewModel.swift

@@ -85,7 +85,7 @@ final class HomeViewModel {
     /// set (unlike a full collection tree), so the N+1 here is acceptable
     /// where it wouldn't be in the sidebar.
     private func fetchPinnedThrowing() async throws -> [OutlineDocument] {
-        let pins = try await apiClient.listPins(ListPinsRequest(collectionId: nil))
+        let pins = try await RetryPolicy.withRetry { try await apiClient.listPins(ListPinsRequest(collectionId: nil)) }
         var documents: [OutlineDocument] = []
         for pin in pins {
             if let document = try? await apiClient.documentInfo(id: pin.documentId) {
@@ -134,7 +134,7 @@ final class HomeViewModel {
 
     private func resolveCurrentUserID() async throws -> String {
         if let currentUserID { return currentUserID }
-        let user = try await apiClient.currentUser()
+        let user = try await RetryPolicy.withRetry { try await apiClient.currentUser() }
         currentUserID = user.id
         return user.id
     }

Outpost/Root/APIFailureCenter.swift

@@ -0,0 +1,66 @@
+import Observation
+import OutlineKit
+
+/// Turns `CachingOutlineAPIClient.repeatedFailureSummaries()` into a banner
+/// the user can actually see and act on, instead of a silently-swallowed
+/// `try?` — see the pins bug this whole mechanism exists to catch a repeat
+/// of. `RootView` polls the client periodically and feeds results in via
+/// `update(with:)`; nothing here talks to the network directly.
+@MainActor
+@Observable
+final class APIFailureCenter {
+    /// The single most-relevant category to show right now, or nil if
+    /// nothing's currently past the threshold (or everything past it has
+    /// been dismissed and is still in its cooldown).
+    private(set) var activeBanner: RepeatedFailure?
+
+    /// Categories the user's already dismissed, and when — suppressed from
+    /// reappearing until `dismissCooldown` passes, so a still-flaky
+    /// operation doesn't pop the same banner right back up a few seconds
+    /// after being told to go away.
+    private var dismissedAt: [String: Date] = [:]
+    private let dismissCooldown: TimeInterval = 900
+
+    /// Called from `RootView`'s poll loop with the latest snapshot from
+    /// `CachingOutlineAPIClient`. Picks the worst-offending category
+    /// (highest failure count) that isn't in cooldown; clears the banner
+    /// entirely once nothing qualifies (e.g. the user went back online and
+    /// everything recovered).
+    func update(with summaries: [RepeatedFailure]) {
+        let now = Date()
+        dismissedAt = dismissedAt.filter { now.timeIntervalSince($0.value) < dismissCooldown }
+
+        let eligible = summaries
+            .filter { dismissedAt[$0.category] == nil }
+            .sorted { $0.count > $1.count }
+
+        activeBanner = eligible.first
+    }
+
+    /// Dismiss without reporting — starts that category's cooldown so it
+    /// won't immediately reappear on the next poll if it's still failing.
+    func dismiss() {
+        guard let category = activeBanner?.category else { return }
+        dismissedAt[category] = Date()
+        activeBanner = nil
+    }
+
+    /// Everything folded into the report is safe to paste into a public bug
+    /// tracker as-is: a category name, a generic error description, and
+    /// version numbers — no document content, no server URL, no token.
+    func reportURL(appVersion: String, osVersion: String) -> URL? {
+        guard let banner = activeBanner else { return nil }
+        var components = URLComponents(string: "https://git.psmattas.com/psmattas/Outpost/issues/new")
+        let body = """
+        Outpost kept failing to \(banner.category) (\(banner.count) times in the last few minutes).
+
+        Error: \(banner.message)
+        App version: \(appVersion)
+        macOS: \(osVersion)
+
+        <!-- Anything else you can add about what you were doing when this started would help. -->
+        """
+        components?.queryItems = [URLQueryItem(name: "body", value: body)]
+        return components?.url
+    }
+}

Outpost/Root/RepeatedFailureBanner.swift

@@ -0,0 +1,38 @@
+#if os(macOS)
+import SwiftUI
+
+/// Shown when the same category of API call has failed repeatedly within a
+/// few minutes (see `APIFailureCenter`) — the self-diagnosing replacement
+/// for a `try?` that used to fail silently. No manual "Retry" button: the
+/// retries already happened automatically before this ever appears, so all
+/// that's left worth offering is reporting it and moving on.
+struct RepeatedFailureBanner: View {
+    let message: String
+    let onReport: () -> Void
+    let onDismiss: () -> Void
+
+    var body: some View {
+        HStack(spacing: 8) {
+            Image(systemName: "exclamationmark.triangle")
+                .foregroundStyle(.orange)
+            Text(message)
+                .font(.callout)
+                .lineLimit(2)
+            Spacer(minLength: 8)
+            Button("Report", action: onReport)
+                .buttonStyle(.borderedProminent)
+                .controlSize(.small)
+            Button {
+                onDismiss()
+            } label: {
+                Image(systemName: "xmark")
+            }
+            .buttonStyle(.plain)
+            .foregroundStyle(.secondary)
+        }
+        .padding(.horizontal, 12)
+        .padding(.vertical, 8)
+        .background(Color.orange.opacity(0.12))
+    }
+}
+#endif

Outpost/Root/RootView.swift

@@ -3,8 +3,10 @@ import OutlineKit
 
 struct RootView: View {
     @Environment(SessionStore.self) private var session
+    @Environment(\.openURL) private var openURL
     @State private var welcomeName: String?
     @State private var starStore = StarStore()
+    @State private var failureCenter = APIFailureCenter()
     @AppStorage("outpost.fullLocalSyncEnabled") private var isFullLocalSyncEnabled = false
     @AppStorage(CachingOutlineAPIClient.offlineModeDefaultsKey) private var isOfflineModeEnabled = false
 
@@ -34,10 +36,39 @@ struct RootView: View {
             }
         }
         .environment(starStore)
+        .environment(failureCenter)
+        #if os(macOS)
+        .overlay(alignment: .top) {
+            if let banner = failureCenter.activeBanner {
+                RepeatedFailureBanner(
+                    message: bannerMessage(for: banner),
+                    onReport: { reportActiveFailure() },
+                    onDismiss: { failureCenter.dismiss() }
+                )
+                .transition(.move(edge: .top).combined(with: .opacity))
+            }
+        }
+        .animation(.easeInOut(duration: 0.2), value: failureCenter.activeBanner)
+        #endif
         .animation(.easeInOut(duration: 0.45), value: welcomeName != nil)
         .task {
             await session.refreshTeamInfoIfNeeded()
         }
+        // Repeated (non-transient) API failures already get an automatic
+        // retry-with-backoff inside CachingOutlineAPIClient itself — this
+        // just surfaces the ones that kept failing anyway, on a cheap poll
+        // (the client's own state, no network call of its own) rather than
+        // a push, since the client is a plain actor with no UI dependency.
+        .task(id: session.isSignedIn) {
+            guard session.isSignedIn else { return }
+            while !Task.isCancelled {
+                if let cachingClient = session.cachingClient {
+                    let summaries = await cachingClient.repeatedFailureSummaries()
+                    failureCenter.update(with: summaries)
+                }
+                try? await Task.sleep(for: .seconds(30))
+            }
+        }
         .task(id: session.isSignedIn) {
             if session.isSignedIn, let apiClient = session.apiClient {
                 await starStore.load(apiClient: apiClient)
@@ -89,6 +120,35 @@ struct RootView: View {
         }
     }
 
+    #if os(macOS)
+    /// Category names are internal plumbing (`documents-write`, `pins`,
+    /// `collections-write`, ...) — this is the one place they turn into
+    /// something a user reads, so a new category added later just needs a
+    /// case here, not a rewrite of the tracking/polling underneath it.
+    private func bannerMessage(for failure: RepeatedFailure) -> String {
+        switch failure.category {
+        case "documents-write": return "Outpost is having trouble saving your document edits."
+        case "collections-write": return "Outpost is having trouble saving collection changes."
+        case "pins": return "Outpost is having trouble updating pins."
+        case "subscriptions": return "Outpost is having trouble updating subscriptions."
+        case "stars": return "Outpost is having trouble updating stars."
+        case "document", "documents": return "Outpost is having trouble loading documents."
+        case "collections": return "Outpost is having trouble loading collections."
+        case "drafts": return "Outpost is having trouble loading drafts."
+        default: return "Outpost is having trouble talking to the server (\(failure.category))."
+        }
+    }
+
+    private func reportActiveFailure() {
+        guard let url = failureCenter.reportURL(
+            appVersion: OutpostVersion.displayString,
+            osVersion: ProcessInfo.processInfo.operatingSystemVersionString
+        ) else { return }
+        openURL(url)
+        failureCenter.dismiss()
+    }
+    #endif
+
     private func startWelcomeTransition(_ result: AuthViewModel.AuthResult) {
         welcomeName = result.user.name
         session.signIn(serverURL: result.serverURL, user: result.user, team: result.team)

Outpost/Root/SessionStore.swift

@@ -136,7 +136,7 @@ final class SessionStore {
     /// in-memory state didn't.
     func refreshTeamInfoIfNeeded() async {
         guard isSignedIn, teamName == nil, let apiClient, let serverURL else { return }
-        guard let auth = try? await apiClient.authInfo() else { return }
+        guard let auth = try? await RetryPolicy.withRetry({ try await apiClient.authInfo() }) else { return }
         apply(user: auth.user, team: auth.team, serverURL: serverURL)
     }
 

Outpost/Support/StarStore.swift

@@ -22,7 +22,7 @@ final class StarStore {
     }
 
     func load(apiClient: OutlineAPIClient) async {
-        guard let stars = try? await apiClient.listStars(ListStarsRequest(offset: 0, limit: 250)) else { return }
+        guard let stars = try? await RetryPolicy.withRetry({ try await apiClient.listStars(ListStarsRequest(offset: 0, limit: 250)) }) else { return }
         documentStars = Dictionary(uniqueKeysWithValues: stars.compactMap { star in
             star.documentId.map { ($0, star) }
         })