Bump Spectre.Console dependencies to 0.55.0 and fix breaking changes

[Copilot]

Recreates the dependency bump from PR #45, bumping all three Spectre.Console packages to 0.55.0 and fixing the breaking changes introduced by that release.

Dependency Updates

• Spectre.Console: 0.54.0 → 0.55.0
• Spectre.Console.Cli: 0.53.1 → 0.55.0
• Spectre.Console.Testing: 0.54.0 → 0.55.0

Breaking Change Fixes

Spectre.Console 0.55.0 converts Style from a class to a struct and introduces a new TableCell type. The following fixes address the resulting build failures and test failures:

1. TableCell ambiguous reference (ConsoleObjectRenderers.cs): Added using TableCell = Markdig.Extensions.Tables.TableCell; alias to resolve the ambiguity between Spectre.Console.TableCell and Markdig.Extensions.Tables.TableCell.

2. Nullable Style struct unwrap (ConsoleRendererBase.Frame.cs): BorderStyle() now takes Style (not Style?), so used borderStyle!.Value in the branch that is guaranteed non-null.

3. Ternary default resolved as struct, not null (ConsoleRendererBase.cs): Style.Plain : default had default inferred as default(Style) (a zero-initialized struct) instead of null. A non-null Nullable<Style> was always assigned, so NoBorder() was never called — all frames got visible borders regardless of IncludeDebug. Fixed by using (Style?)null.

4. Ternary null triggering op_Implicit(string) with null (ConsoleRendererBase.cs): After fix Allow caller to overwrite styling #3, the remaining issue was that Style.Plain : null caused the compiler to prefer string as the type of null (since op_Implicit(String)->Style exists), generating a call to Style.op_Implicit(null) which throws NullReferenceException. Fixed by using (Style?)null.

5. Test style comparison (RendererTests.cs): In 0.55.0, rendered segments now include colors inherited from the rendering context (e.g. #000000 on #000000 from the default TestConsole style). Updated Check() to only compare color components that were explicitly set in the expected style, while still strictly comparing decoration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.46%. Comparing base (3d80bc6) to head (6450b17).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   90.46%   90.46%           
=======================================
  Files          18       18           
  Lines         839      839           
  Branches       86       86           
=======================================
  Hits          759      759           
  Misses         59       59           
  Partials       21       21           

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[boxofyellow]

@copilot please take a look at this comment.

[boxofyellow]

@copilot why is the ! required here? this is in the else block of the borderStyle == default check.

I don't recall, is/was Style an object or a struct?

This might be more readable

if (borderStyle.HasValue)
{
    Table.NoBorder(borderStyle.Value);
}
else
{
    Table.NoBorder();
}

[Copilot]

You're right — Style was a class in 0.54.0 and is now a struct in 0.55.0. The ! was a workaround: the compiler doesn't recognize borderStyle == default as a null-guard in its flow analysis (unlike borderStyle == null or borderStyle.HasValue), so it still emitted CS8629. Using HasValue/Value makes the intent explicit and avoids needing the null-forgiving operator. Fixed in 6450b17 (note: your example had NoBorder in both branches — I used BorderStyle in the HasValue branch).

[Copilot]

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

Warning

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• notaplace.com
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• okforreallyrealsthisnotaplace.com
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