feat: add 8h/12h intervals + daily schedule refresh mode

- Added 8-hour and 12-hour polling interval options
- Added 'Daily schedule' mode (pollIntervalSeconds = -1): fires at
  specific wall-clock times configured in dailyRefreshTimes (e.g. 08:00, 14:00)
- PollerService: in daily mode, checks every 60s and triggers fetch when
  current time matches a scheduled time (with 2-min dedup window)
- Settings UI: shows HH:mm text field when daily schedule is selected
- AppConfig: added dailyRefreshTimes: [String] field

Co-Authored-By: Claude <noreply@anthropic.com>

Sources/Models/AppConfig.swift

@@ -6,6 +6,9 @@ struct AppConfig: Codable, Equatable {
     var assigneeName: String = ""
     var fieldMappings: FieldMappings = FieldMappings()
     var pollIntervalSeconds: Int = 300
+    /// Daily refresh times in "HH:mm" format, e.g. ["08:00", "14:00"].
+    /// Only used when pollIntervalSeconds == -1.
+    var dailyRefreshTimes: [String] = []
     var showFloatingWidget: Bool = false
     var launchAtLogin: Bool = true
     var feishuBaseDomain: String = "xorbitlab.feishu.cn"

Sources/Services/PollerService.swift

@@ -12,6 +12,7 @@ final class PollerService {
 
     private var timer: Timer?
     private var isFetching = false
+    private var lastFetchTime: Date?
 
     private(set) var isRunning = false
 
@@ -32,10 +33,18 @@ final class PollerService {
 
         Task { await performFetch() }
 
-        timer = Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { [weak self] _ in
-            Task { await self?.performFetch() }
+        if interval < 0 {
+            // Daily schedule mode: check every 60s, fire at configured times
+            timer = Timer.scheduledTimer(withTimeInterval: 60, repeats: true) { [weak self] _ in
+                self?.checkDailySchedule()
+            }
+            timer?.tolerance = 5
+        } else {
+            timer = Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { [weak self] _ in
+                Task { await self?.performFetch() }
+            }
+            timer?.tolerance = interval * 0.1
         }
-        timer?.tolerance = interval * 0.1
     }
 
     func stop() {
@@ -53,11 +62,34 @@ final class PollerService {
         await performFetch()
     }
 
+    // MARK: - Daily schedule
+
+    private func checkDailySchedule() {
+        guard let config = configService.config else { return }
+
+        let formatter = DateFormatter()
+        formatter.dateFormat = "HH:mm"
+        let now = formatter.string(from: Date())
+
+        guard config.dailyRefreshTimes.contains(now) else { return }
+
+        // Avoid firing twice in the same minute
+        if let last = lastFetchTime, Date().timeIntervalSince(last) < 120 {
+            return
+        }
+
+        Task { await performFetch() }
+    }
+
+    // MARK: - Fetch
+
     private func performFetch() async {
         guard !isFetching else { return }
         isFetching = true
         defer { isFetching = false }
 
+        lastFetchTime = Date()
+
         await MainActor.run {
             bugStore.setLoading(true)
             bugStore.setError(nil)

Sources/Views/Settings/SettingsView.swift

@@ -51,7 +51,25 @@ struct SettingsView: View {
                         Text("1 hour").tag(3_600)
                         Text("2 hours").tag(7_200)
                         Text("4 hours").tag(14_400)
+                        Text("8 hours").tag(28_800)
+                        Text("12 hours").tag(43_200)
                         Text("1 day").tag(86_400)
+                        Divider()
+                        Text("Daily schedule").tag(-1)
+                    }
+
+                    if config.pollIntervalSeconds == -1 {
+                        VStack(alignment: .leading, spacing: 4) {
+                            Text("Refresh at these times (comma-separated, 24h):")
+                                .font(.caption)
+                                .foregroundStyle(.secondary)
+                            TextField("08:00, 14:00", text: dailyTimesBinding)
+                                .font(.caption)
+                                .textFieldStyle(.roundedBorder)
+                            Text("Example: 08:00, 14:00, 20:00")
+                                .font(.caption2)
+                                .foregroundStyle(.secondary)
+                        }
                     }
                 }
 
@@ -147,6 +165,20 @@ struct SettingsView: View {
         .padding(.vertical, 2)
     }
 
+    // MARK: - Daily times binding
+
+    private var dailyTimesBinding: Binding<String> {
+        Binding<String>(
+            get: { config.dailyRefreshTimes.joined(separator: ", ") },
+            set: { newValue in
+                config.dailyRefreshTimes = newValue
+                    .components(separatedBy: ",")
+                    .map { $0.trimmingCharacters(in: .whitespaces) }
+                    .filter { !$0.isEmpty }
+            }
+        )
+    }
+
     // MARK: - Actions
 
     private func save() {