fix: resolve client startup crash by explicitly passing ConfigurationReaderOptions for Serilog

docs/changelog/v0.2.10.md

@@ -14,6 +14,7 @@ Follow-up patch release for v0.2.9 addressing auto-updater regressions, adding a
 - Simplify update progress dispatch — remove redundant `Application.Invoke` wrappers around progress updates that are already called from the UI thread (introduced while fixing the freeze above)
 - Fix cursor position being reset to the start of the line when auto-completing commands in the CLI app — insertion point is now moved to the end of the completed text
 - Fix notification sounds crashing or being silently dropped when several arrive in quick succession — playback is now serialized through a semaphore that's held for the duration of each sound (using `PlaybackFinished` with a 10s safety timeout) and always released in `finally`, so back-to-back notifications queue up and play in order instead of racing the underlying audio player (fixes #20)
+- Fix client crashing on startup with `No Serilog:Using configuration section is defined` under single-file publish — pass `ConfigurationReaderOptions` with the `Serilog.Sinks.File` assembly explicitly so Serilog can resolve sinks without scanning the filesystem for `.dll`s (which don't exist in a bundled exe)
 
 ## Refactoring
 

src/EchoHub.Client/Program.cs

@@ -4,6 +4,7 @@ using EchoHub.Client.Services;
 using EchoHub.Client.Themes;
 using Microsoft.Extensions.Configuration;
 using Serilog;
+using Serilog.Settings.Configuration;
 using Terminal.Gui.App;
 
 // == CLI rollback: works without TUI, before anything else ================
@@ -71,8 +72,11 @@ var configuration = new ConfigurationBuilder()
     .AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
     .Build();
 
+// Explicit sink-assembly reference is required under PublishSingleFile — the default
+// AssemblyFinder scans for Serilog.Sinks.*.dll on disk, which don't exist in a bundled exe.
+var serilogOptions = new ConfigurationReaderOptions(typeof(FileLoggerConfigurationExtensions).Assembly);
 Log.Logger = new LoggerConfiguration()
-    .ReadFrom.Configuration(configuration)
+    .ReadFrom.Configuration(configuration, serilogOptions)
     .CreateLogger();
 
 Log.Information("EchoHub client starting");