feat: add resumability detection and pause warnings

- Update 'fetch_metadata' to detect 'Accept-Ranges' HTTP header
- Persist 'resumable' flag in DownloadItem across backend and frontend
- Add confirmation dialog when pausing non-resumable downloads (single and bulk actions)
- Improve UI for start/pause/options buttons by adopting the application accent color on hover

src-tauri/src/ipc.rs

@@ -79,6 +79,8 @@ pub struct DownloadItem {
     pub category: DownloadCategory,
     pub date_added: String,
     #[ts(optional)]
+    pub resumable: Option<bool>,
+    #[ts(optional)]
     pub connections: Option<i32>,
     #[ts(optional)]
     pub speed_limit: Option<String>,

src-tauri/src/lib.rs

@@ -21,6 +21,7 @@ pub struct MetadataResponse {
     size: String,
     #[ts(type = "number")]
     size_bytes: u64,
+    resumable: bool,
 }
 
 #[derive(Debug, Serialize, serde::Deserialize, Clone, TS)]
@@ -954,11 +955,21 @@ async fn fetch_metadata(
         }
     }
 
+    let mut resumable = false;
+    if let Some(accept_ranges) = res.headers().get(reqwest::header::ACCEPT_RANGES) {
+        if let Ok(accept_ranges_str) = accept_ranges.to_str() {
+            if accept_ranges_str.to_lowercase().contains("bytes") {
+                resumable = true;
+            }
+        }
+    }
+
     Ok(MetadataResponse {
         url: current_url,
         filename,
         size: size_str,
         size_bytes,
+        resumable,
     })
 }
 

src/bindings/DownloadItem.ts

@@ -2,4 +2,4 @@
 import type { DownloadCategory } from "./DownloadCategory";
 import type { DownloadStatus } from "./DownloadStatus";
 
-export type DownloadItem = { id: string, url: string, fileName: string, status: DownloadStatus, fraction?: number, speed?: string, eta?: string, size?: string, category: DownloadCategory, dateAdded: string, connections?: number, speedLimit?: string, username?: string, password?: string, headers?: string, checksum?: string, cookies?: string, mirrors?: string, destination?: string, isMedia?: boolean, mediaFormatSelector?: string, queueId?: string, queuePosition?: number, hasBeenDispatched?: boolean, };
+export type DownloadItem = { id: string, url: string, fileName: string, status: DownloadStatus, fraction?: number, speed?: string, eta?: string, size?: string, category: DownloadCategory, dateAdded: string, resumable?: boolean, connections?: number, speedLimit?: string, username?: string, password?: string, headers?: string, checksum?: string, cookies?: string, mirrors?: string, destination?: string, isMedia?: boolean, mediaFormatSelector?: string, queueId?: string, queuePosition?: number, hasBeenDispatched?: boolean, };

src/bindings/MetadataResponse.ts

@@ -1,3 +1,3 @@
 // This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 
-export type MetadataResponse = { url: string, filename: string, size: string, size_bytes: number, };
+export type MetadataResponse = { url: string, filename: string, size: string, size_bytes: number, resumable: boolean, };

src/bindings/PersistedSettings.ts

@@ -8,4 +8,13 @@ import type { SettingsTab } from "./SettingsTab";
 import type { SiteLogin } from "./SiteLogin";
 import type { Theme } from "./Theme";
 
-export type PersistedSettings = { theme: Theme, baseDownloadFolder: string, categorySubfolders: { [key in string]: string }, categoryDirectoryOverrides: { [key in string]: string }, approvedDownloadRoots: Array<string>, maxConcurrentDownloads: number, globalSpeedLimit: string, isSidebarVisible: boolean, activeSettingsTab: SettingsTab, scheduler: SchedulerSettings, schedulerRunning: boolean, schedulerActiveDownloadIds: Array<string>, schedulerLastStartKey: string, schedulerLastStopKey: string, lastCustomSpeedLimitKiB: number, perServerConnections: number, maxAutomaticRetries: number, showNotifications: boolean, playCompletionSound: boolean, appFontSize: AppFontSize, listRowDensity: ListRowDensity, showDockBadge: boolean, showMenuBarIcon: boolean, proxyMode: ProxyMode, proxyHost: string, proxyPort: number, customUserAgent: string, askWhereToSaveEachFile: boolean, preventsSleepWhileDownloading: boolean, mediaCookieSource: MediaCookieSource, siteLogins: Array<SiteLogin>, extensionPairingToken: string, autoCheckUpdates: boolean, keychainAccessGranted: boolean, };
+export type PersistedSettings = { theme: Theme, baseDownloadFolder: string, categorySubfolders: { [key in string]: string }, categoryDirectoryOverrides: { [key in string]: string }, approvedDownloadRoots: Array<string>, maxConcurrentDownloads: number, globalSpeedLimit: string, isSidebarVisible: boolean, activeSettingsTab: SettingsTab, scheduler: SchedulerSettings, schedulerRunning: boolean, schedulerActiveDownloadIds: Array<string>, schedulerLastStartKey: string, schedulerLastStopKey: string, lastCustomSpeedLimitKiB: number, perServerConnections: number, maxAutomaticRetries: number, showNotifications: boolean, playCompletionSound: boolean, appFontSize: AppFontSize, listRowDensity: ListRowDensity, showDockBadge: boolean, showMenuBarIcon: boolean, proxyMode: ProxyMode, proxyHost: string, proxyPort: number, customUserAgent: string, askWhereToSaveEachFile: boolean, preventsSleepWhileDownloading: boolean, mediaCookieSource: MediaCookieSource, siteLogins: Array<SiteLogin>, 
+/**
+ * The HMAC shared secret for the browser extension.  It is persisted in the
+ * settings database so that startup never needs to touch the OS keychain.
+ * The keychain is still used as defence-in-depth — grant_keychain_access
+ * writes the token there — but the DB copy is the primary read path,
+ * eliminating the OS credential prompt that macOS shows when the binary
+ * signature changes after an update.
+ */
+extensionPairingToken: string, autoCheckUpdates: boolean, keychainAccessGranted: boolean, };

src/components/AddDownloadsModal.tsx

@@ -264,7 +264,8 @@ export const AddDownloadsModal = () => {
                 ),
                 size: meta.size_bytes ? meta.size : undefined,
                 sizeBytes: meta.size_bytes || undefined,
-                status: 'ready'
+                status: 'ready',
+                resumable: meta.resumable
               })
             ));
           }
@@ -617,6 +618,7 @@ export const AddDownloadsModal = () => {
             ? finalLocation
             : destinationOverrides[itemIndex],
           isMedia: item.isMedia,
+          resumable: item.resumable,
           mediaFormatSelector: formatSelector,
           size: item.size || (item.sizeBytes ? formatBytes(item.sizeBytes) : undefined)
         }, action);

src/components/DownloadItem.tsx

@@ -12,7 +12,7 @@ interface DownloadItemProps {
   index: number;
   tableGridTemplate: string;
   setContextMenu: (menu: { x: number; y: number; id: string }) => void;
-  handlePause: (id: string) => void;
+  handlePause: (id: string, skipConfirm?: boolean) => void;
   handleResume: (item: DownloadItemType) => void;
   getCategoryIcon: (category: string) => React.ReactNode;
   isSelected: boolean;

src/components/DownloadTable.tsx

@@ -255,7 +255,15 @@ export const DownloadTable: React.FC<DownloadTableProps> = ({ filter }) => {
     }
   };
 
-  const handlePause = async (id: string) => {
+  const handlePause = async (id: string, skipConfirm = false) => {
+    const download = useDownloadStore.getState().downloads.find(d => d.id === id);
+    if (!skipConfirm && download && download.resumable === false) {
+      const confirmPause = window.confirm("This download does not support resuming. If you pause it, you will have to start over again later. Are you sure you want to pause?");
+      if (!confirmPause) {
+        return;
+      }
+    }
+
     try {
       await invoke('pause_download', { id });
     } catch (e) {
@@ -324,7 +332,20 @@ export const DownloadTable: React.FC<DownloadTableProps> = ({ filter }) => {
             className="main-control-button" 
             disabled={sortedDownloads.length === 0}
             onClick={() => {
-              sortedDownloads.filter(d => canPauseDownload(d.status)).forEach(d => handlePause(d.id));
+              const toPause = sortedDownloads.filter(d => canPauseDownload(d.status));
+              const nonResumableCount = toPause.filter(d => d.resumable === false).length;
+              if (nonResumableCount > 0) {
+                const confirmPause = window.confirm(
+                  nonResumableCount === 1
+                    ? "1 download does not support resuming. If you pause it, you will have to start over again later. Are you sure you want to pause?"
+                    : `${nonResumableCount} downloads do not support resuming. If you pause them, you will have to start over again later. Are you sure you want to pause?`
+                );
+                if (!confirmPause) {
+                  return;
+                }
+              }
+              // Skip the individual check by passing a flag to handlePause, or just invoking directly.
+              toPause.forEach(d => handlePause(d.id, true));
             }}
             title="Pause All"
           >

src/index.css

@@ -394,6 +394,16 @@
     transform: scale(0.94);
   }
 
+  .download-cell-right .app-icon-button:hover:not(:disabled) {
+    background: hsl(var(--accent-color) / 0.15);
+    color: hsl(var(--accent-color));
+  }
+
+  .download-cell-right .app-icon-button:active:not(:disabled) {
+    background: hsl(var(--accent-color) / 0.25);
+    transform: scale(0.94);
+  }
+
   .app-modal-backdrop {
     background: hsl(0 0% 0% / 0.2);
     animation: fade-in 150ms ease-out;

src/utils/addDownloadMetadata.ts

@@ -27,6 +27,7 @@ export interface AddDownloadDraftRow {
   status: MetadataStatus;
   generation: number;
   isMedia: boolean;
+  resumable?: boolean;
   formats?: AddMediaFormat[];
   selectedFormat?: number;
 }