Improve semaphore usage and logging clarity

Added comments in `EverythingAPI.cs` and `Main.cs` to explain
why `CancellationToken` is not directly passed to semaphore
locks, preventing unexpected `OperationCanceledException`.

Updated debug log messages in `Main.cs` for better clarity,
including changing "Start handling programs" to "Start querying
programs". Removed redundant log messages to improve logging
consistency.

Author: Jack251970

Plugins/Flow.Launcher.Plugin.Explorer/Search/Everything/EverythingAPI.cs

@@ -48,6 +48,8 @@ public static bool IsFastSortOption(EverythingSortOption sortOption)
 
         public static async ValueTask<bool> IsEverythingRunningAsync(CancellationToken token = default)
         {
+            // We do not directly pass token here, but we check IsCancellationRequested inside the lock
+            // So that it will not raise OperationCanceledException, which is not expected by the caller.`
             await _semaphore.WaitAsync();
 
             try

Plugins/Flow.Launcher.Plugin.Program/Main.cs

@@ -84,6 +84,8 @@ public async Task<List<Result>> QueryAsync(Query query, CancellationToken token)
             {
                 var resultList = await Task.Run(async () =>
                 {
+                    // We do not directly pass token here, but we check IsCancellationRequested inside the lock
+                    // So that it will not raise OperationCanceledException, which is not expected by the caller.`
                     Context.API.LogDebug(ClassName, "Preparing win32 programs");
                     List<Win32> win32s;
                     await _win32sLock.WaitAsync();
@@ -97,6 +99,8 @@ public async Task<List<Result>> QueryAsync(Query query, CancellationToken token)
                         _win32sLock.Release();
                     }
 
+                    // We do not directly pass token here, but we check IsCancellationRequested inside the lock
+                    // So that it will not raise OperationCanceledException, which is not expected by the caller.`
                     Context.API.LogDebug(ClassName, "Preparing UWP programs");
                     List<UWPApp> uwps;
                     await _uwpsLock.WaitAsync();
@@ -110,7 +114,7 @@ public async Task<List<Result>> QueryAsync(Query query, CancellationToken token)
                         _uwpsLock.Release();
                     }
 
-                    Context.API.LogDebug(ClassName, "Start hanlding programs");
+                    Context.API.LogDebug(ClassName, "Start querying programs");
                     try
                     {
                         // Collect all UWP Windows app directories
@@ -324,7 +328,6 @@ static void WatchProgramUpdate()
 
         public static async Task IndexWin32ProgramsAsync()
         {
-            Context.API.LogDebug(ClassName, "Prepare indexing Win32 programs");
             await _win32sLock.WaitAsync();
             Context.API.LogDebug(ClassName, "Start indexing Win32 programs");
             try
@@ -354,7 +357,6 @@ public static async Task IndexWin32ProgramsAsync()
 
         public static async Task IndexUwpProgramsAsync()
         {
-            Context.API.LogDebug(ClassName, "Prepare indexing Uwp programs");
             await _uwpsLock.WaitAsync();
             Context.API.LogDebug(ClassName, "Start indexing Uwp programs");
             try