Refactor code review suggestions: conditional logic and explicit filtering

[Copilot]

Addresses five code review comments from PR #8 focusing on code clarity and idiomaticity.

Changes:

• SlideshowHandler.cs (lines 387-394): Fixed slideshow header to respect HideStatus flag. Content now starts at line 1 when header is hidden, instead of incorrectly reserving line 1.

• BrailleInterlacePlayer.cs (lines 197-199): Replaced implicit filtering pattern with explicit Count():

  // Before: implicit filter with nested if
  foreach (var c in _frames[i].Content)
      if (c == '\n')
          lineCount++;
  
  // After: explicit Count()
  var lineCount = 1 + _frames[i].Content.Count(ch => ch == '\n');

• SlideshowHandler.cs (lines 1082-1085): Replaced if-else with ternary operator for string truncation logic.

• BrailleRenderer.cs (lines 551-554, 588-591): Replaced if-else with ternary operators for threshold calculations in two locations.

All changes maintain existing functionality while improving code clarity and consistency.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: /usr/share/dotnet/dotnet dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)
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  • Triggering command: /usr/share/dotnet/dotnet dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll ptions m.cs p/bin/grep (dns block)

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