⚡ Bolt: TuiColor.ParseFunctional String Parsing Optimization

[tedd]

💡 Hypothesis:
The string allocation footprint inside TuiColor.ParseFunctional() when resolving rgb() and rgba() CSS-style definitions creates unnecessary GC pressure during dynamic UI updates. string.Split(',') and .Substring() calls create multiple intermediate objects.

🎯 Execution:
Refactored TuiColor.ParseFunctional, ParseColorComponent, and ParseAlphaComponent to completely eliminate string allocations by utilizing:

• ReadOnlySpan<char> parameter passing.
• String slicing via .Slice().
• .Split(stackalloc Range[4], ',') to manually separate comma-delimited components onto the stack.

📊 Empirical Impact:

Method	Mean	Error	StdDev	Gen0	Allocated
ParseFunctional_Legacy_Rgba	392.1 ns	2.62 ns	2.33 ns	0.0138	336 B
ParseFunctional_Optimized_Rgba	217.8 ns	1.20 ns	1.12 ns	-	-
ParseFunctional_Legacy_Rgb	261.6 ns	0.93 ns	0.83 ns	0.0105	256 B
ParseFunctional_Optimized_Rgb	120.4 ns	0.35 ns	0.29 ns	-	-

Time complexity remains $O(N)$, but space complexity is reduced from $O(N)$ arrays to $O(1)$ stack allocations. Allocations reduced to $0$ Bytes. Execution latency reduced by ~45-50%.

🔬 Verification Protocol:

1. Build Tedd.TUI.Benchmarks.
2. Execute: dotnet run -c Release --project src/Tedd.TUI.Benchmarks/ --filter "*ParseFunctionalBenchmark*"

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PR created automatically by Jules for task 271079060976873440 started by @tedd

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