fix(installer): expand ~ in UiDbPath

src/ClaudeDo.Installer/Steps/WriteConfigStep.cs

@@ -29,7 +29,7 @@ public sealed class WriteConfigStep : IInstallStep
 
             var uiCfg = new InstallerAppSettings
             {
-                DbPath = ctx.UiDbPath,
+                DbPath = Paths.Expand(ctx.UiDbPath),
                 SignalRUrl = ctx.SignalRUrl,
             };
             uiCfg.Save();