feat(queue): announce tool preparation before every download starts

On a fresh installation the first download repairs the managed
Streamlink and FFmpeg copies, which downloads and extracts roughly two
hundred megabytes before the actual VOD transfer begins. The queue item
previously sat on a generic starting status for that entire window - the
old preparing hint only appeared when the streamlink command had not
been verified yet, and a prior System Check verifies the command without
making the managed repair any cheaper, so users saw no explanation for
delays of a minute or more. All three download paths - VOD, live
recording and merge groups - now report a dedicated localized
"Preparing download tools" status before the tool gates run, and the
misleading conditional hint was removed.

src/main.ts

@@ -129,7 +129,7 @@ import {
     refreshBundledToolPaths, ensureStreamlinkInstalled, ensureFfmpegInstalled,
     getManagedToolStatuses, repairManagedTools, resetManagedTools,
     canExecute, canExecuteCommand,
-    cacheVerifiedStreamlinkCommand, isVerifiedStreamlinkCommand,
+    cacheVerifiedStreamlinkCommand,
     cacheVerifiedFfmpegCommands, isVerifiedFfmpegCommands,
     invalidateVerifiedToolCaches, setManagedToolExecutionObserver
 } from './tools';
@@ -5885,6 +5885,16 @@ async function downloadLiveStream(
     item: QueueItem,
     onProgress: (progress: DownloadProgress) => void
 ): Promise<DownloadResult> {
+    onProgress({
+        id: item.id,
+        progress: -1,
+        speed: '',
+        eta: '',
+        status: tBackend('statusPreparingTools'),
+        currentPart: 0,
+        totalParts: 0
+    });
+
     const streamlinkReady = await ensureStreamlinkInstalled();
     if (!streamlinkReady) {
         return { success: false, error: tBackend('streamlinkAutoInstallFailed') };
@@ -6203,21 +6213,15 @@ async function downloadVOD(
         };
     }
 
-    const streamlinkCmd = getStreamlinkCommand();
-    const streamlinkVersionArgs = [...streamlinkCmd.prefixArgs, '--version'];
-    const streamlinkAlreadyVerified = isVerifiedStreamlinkCommand(streamlinkCmd.command, streamlinkVersionArgs);
-
-    if (!streamlinkAlreadyVerified) {
-        onProgress({
-            id: item.id,
-            progress: -1,
-            speed: '',
-            eta: '',
-            status: tBackend('statusCheckingTools'),
-            currentPart: 0,
-            totalParts: 0
-        });
-    }
+    onProgress({
+        id: item.id,
+        progress: -1,
+        speed: '',
+        eta: '',
+        status: tBackend('statusPreparingTools'),
+        currentPart: 0,
+        totalParts: 0
+    });
 
     const streamlinkReady = await ensureStreamlinkInstalled();
     if (!streamlinkReady) {
@@ -6469,6 +6473,16 @@ async function processDownloadMergeGroup(
 
     // ---- PHASE 1: DOWNLOADING ----
     if (mg.mergePhase === 'downloading') {
+        onProgress({
+            id: item.id,
+            progress: -1,
+            speed: '',
+            eta: '',
+            status: tBackend('statusPreparingTools'),
+            currentPart: 0,
+            totalParts: 0
+        });
+
         const streamlinkReady = await ensureStreamlinkInstalled();
         if (!streamlinkReady) {
             return { success: false, error: tBackend('streamlinkAutoInstallFailed') };