feat: multi-photo support in feedback (up to 5 screenshots)

iOS:
- PhotosPicker with maxSelectionCount: 5
- Horizontal scroll preview strip with individual remove buttons
- Sends "images" array instead of single "image"

Server:
- Gateway accepts both "image" (single, backwards compat) and
  "images" (array) fields
- Uploads each as separate Gitea issue attachment

Also closed Gitea issues #11, #12, #13, #14.

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

ios/Platform/Platform/Features/Feedback/FeedbackView.swift

@@ -27,9 +27,8 @@ struct FeedbackSheet: View {
     @State private var isSending = false
     @State private var sent = false
     @State private var error: String?
-    @State private var selectedPhoto: PhotosPickerItem?
-    @State private var photoData: Data?
-    @State private var photoPreview: UIImage?
+    @State private var selectedPhotos: [PhotosPickerItem] = []
+    @State private var photoPreviews: [(Data, UIImage)] = []
 
     var body: some View {
         VStack(spacing: 16) {
@@ -68,13 +67,17 @@ struct FeedbackSheet: View {
                             .stroke(Color.textTertiary.opacity(0.2), lineWidth: 1)
                     )
 
-                // Photo attachment
-                HStack {
-                    PhotosPicker(selection: $selectedPhoto, matching: .screenshots) {
+                // Photo attachments
+                VStack(alignment: .leading, spacing: 8) {
+                    PhotosPicker(
+                        selection: $selectedPhotos,
+                        maxSelectionCount: 5,
+                        matching: .images
+                    ) {
                         HStack(spacing: 6) {
                             Image(systemName: "camera.fill")
                                 .font(.caption)
-                            Text(photoPreview != nil ? "Change photo" : "Add screenshot")
+                            Text(photoPreviews.isEmpty ? "Add screenshots" : "Add more")
                                 .font(.caption.weight(.medium))
                         }
                         .foregroundStyle(Color.accentWarm)
@@ -84,25 +87,34 @@ struct FeedbackSheet: View {
                         .clipShape(Capsule())
                     }
 
-                    if let preview = photoPreview {
-                        Image(uiImage: preview)
-                            .resizable()
-                            .scaledToFill()
-                            .frame(width: 40, height: 40)
-                            .clipShape(RoundedRectangle(cornerRadius: 8))
+                    if !photoPreviews.isEmpty {
+                        ScrollView(.horizontal, showsIndicators: false) {
+                            HStack(spacing: 8) {
+                                ForEach(Array(photoPreviews.enumerated()), id: \.offset) { index, item in
+                                    ZStack(alignment: .topTrailing) {
+                                        Image(uiImage: item.1)
+                                            .resizable()
+                                            .scaledToFill()
+                                            .frame(width: 60, height: 60)
+                                            .clipShape(RoundedRectangle(cornerRadius: 8))
 
-                        Button {
-                            photoData = nil
-                            photoPreview = nil
-                            selectedPhoto = nil
-                        } label: {
-                            Image(systemName: "xmark.circle.fill")
-                                .font(.caption)
-                                .foregroundStyle(Color.textTertiary)
+                                        Button {
+                                            photoPreviews.remove(at: index)
+                                            if index < selectedPhotos.count {
+                                                selectedPhotos.remove(at: index)
+                                            }
+                                        } label: {
+                                            Image(systemName: "xmark.circle.fill")
+                                                .font(.system(size: 16))
+                                                .foregroundStyle(.white)
+                                                .background(Circle().fill(.black.opacity(0.5)))
+                                        }
+                                        .offset(x: 4, y: -4)
+                                    }
+                                }
+                            }
                         }
                     }
-
-                    Spacer()
                 }
 
                 if let error {
@@ -131,13 +143,16 @@ struct FeedbackSheet: View {
         }
         .padding()
         .background(Color.surfaceCard)
-        .onChange(of: selectedPhoto) {
+        .onChange(of: selectedPhotos) {
             Task {
-                if let item = selectedPhoto,
-                   let data = try? await item.loadTransferable(type: Data.self) {
-                    photoData = data
-                    photoPreview = UIImage(data: data)
+                var newPreviews: [(Data, UIImage)] = []
+                for item in selectedPhotos {
+                    if let data = try? await item.loadTransferable(type: Data.self),
+                       let image = UIImage(data: data) {
+                        newPreviews.append((data, image))
+                    }
                 }
+                photoPreviews = newPreviews
             }
         }
     }
@@ -149,9 +164,13 @@ struct FeedbackSheet: View {
 
         Task { @MainActor in
             do {
-                var body: [String: Any] = ["text": text.trimmingCharacters(in: .whitespaces), "source": "ios"]
-                if let imgData = photoData {
-                    body["image"] = imgData.base64EncodedString()
+                var body: [String: Any] = [
+                    "text": text.trimmingCharacters(in: .whitespaces),
+                    "source": "ios"
+                ]
+                if !photoPreviews.isEmpty {
+                    let images = photoPreviews.map { $0.0.base64EncodedString() }
+                    body["images"] = images
                 }
                 let jsonData = try JSONSerialization.data(withJSONObject: body)
                 let data = try await APIClient.shared.rawPost(path: "/api/feedback", data: jsonData)