refactor(bitimage): use shared.ToLittleEndian for size conversion

[adcondev]

Replaced manual little-endian conversion logic with shared.ToLittleEndian in pkg/commands/bitimage package to improve code health and consistency. Confirmed functionality with existing tests.

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PR created automatically by Jules for task 8170664250265593066 started by @adcondev

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[github-actions]

👋 Thanks for opening this PR, @adcondev!

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[github-actions]

⚡ Benchmark Results

📈 Performance Comparison

📊 Click to expand detailed results

Current Branch Results

BenchmarkNewDocument-4    	1000000000	         0.3118 ns/op	       0 B/op	       0 allocs/op
BenchmarkBuildSimple-4    	 3744178	       336.1 ns/op	     240 B/op	       4 allocs/op
BenchmarkBuildComplex-4   	  423075	      2706 ns/op	    1809 B/op	      25 allocs/op
BenchmarkToJSON-4         	  514357	      2077 ns/op	     592 B/op	       3 allocs/op
BenchmarkParseDocument_Minimal-4    	  502530	      2309 ns/op	     568 B/op	      14 allocs/op
BenchmarkParseDocument_Receipt-4    	   93655	     12777 ns/op	    2392 B/op	      34 allocs/op
BenchmarkCommandUnmarshal_Text-4    	  427345	      2702 ns/op	     568 B/op	      19 allocs/op
BenchmarkCommandUnmarshal_Table-4   	  276130	      4189 ns/op	     944 B/op	      21 allocs/op
BenchmarkTextCommandParsing-4       	  540770	      2117 ns/op	     544 B/op	      16 allocs/op
BenchmarkTableCommandParsing-4      	  242691	      4779 ns/op	    1000 B/op	      29 allocs/op
BenchmarkParseHexString-4           	 7744710	       154.4 ns/op	      48 B/op	       2 allocs/op
BenchmarkCleanHexString-4           	 6458258	       184.6 ns/op	      64 B/op	       2 allocs/op
BenchmarkContainsSequence-4         	295838120	         4.057 ns/op	       0 B/op	       0 allocs/op
BenchmarkCheckCriticalCommands-4    	33744504	        37.17 ns/op	       0 B/op	       0 allocs/op
BenchmarkDocument_Validate-4       	14450967	        82.51 ns/op	       0 B/op	       0 allocs/op
BenchmarkParseDocument_Simple-4    	  498792	      2395 ns/op	     568 B/op	      14 allocs/op
BenchmarkParseDocument_Complex-4   	  138625	      8599 ns/op	    1352 B/op	      26 allocs/op
BenchmarkPrintImage_Small-4             	     619	   1977325 ns/op	 3469946 B/op	      24 allocs/op
BenchmarkPrintImage_Medium-4            	     312	   3691335 ns/op	 5481087 B/op	      24 allocs/op
BenchmarkPrintImage_ThermalPreview-4    	     138	   8544656 ns/op	 5231176 B/op	  230423 allocs/op

Base Branch Results

BenchmarkNewDocument-4    	1000000000	         0.3118 ns/op	       0 B/op	       0 allocs/op
BenchmarkBuildSimple-4    	 3668593	       327.3 ns/op	     240 B/op	       4 allocs/op
BenchmarkBuildComplex-4   	  437653	      2697 ns/op	    1809 B/op	      25 allocs/op
BenchmarkToJSON-4         	  535678	      2065 ns/op	     592 B/op	       3 allocs/op
BenchmarkParseDocument_Minimal-4    	  504972	      2322 ns/op	     568 B/op	      14 allocs/op
BenchmarkParseDocument_Receipt-4    	   94044	     12603 ns/op	    2392 B/op	      34 allocs/op
BenchmarkCommandUnmarshal_Text-4    	  430147	      2686 ns/op	     568 B/op	      19 allocs/op
BenchmarkCommandUnmarshal_Table-4   	  253207	      4133 ns/op	     944 B/op	      21 allocs/op
BenchmarkTextCommandParsing-4       	  521871	      2144 ns/op	     544 B/op	      16 allocs/op
BenchmarkTableCommandParsing-4      	  245856	      4734 ns/op	    1000 B/op	      29 allocs/op
BenchmarkParseHexString-4           	 7675179	       154.1 ns/op	      48 B/op	       2 allocs/op
BenchmarkCleanHexString-4           	 6522556	       183.1 ns/op	      64 B/op	       2 allocs/op
BenchmarkContainsSequence-4         	296191497	         4.053 ns/op	       0 B/op	       0 allocs/op
BenchmarkCheckCriticalCommands-4    	33551913	        37.12 ns/op	       0 B/op	       0 allocs/op
BenchmarkDocument_Validate-4       	14473544	        82.78 ns/op	       0 B/op	       0 allocs/op
BenchmarkParseDocument_Simple-4    	  498157	      2383 ns/op	     568 B/op	      14 allocs/op
BenchmarkParseDocument_Complex-4   	  139285	      8533 ns/op	    1352 B/op	      26 allocs/op
BenchmarkPrintImage_Small-4             	     598	   1954614 ns/op	 3469937 B/op	      24 allocs/op
BenchmarkPrintImage_Medium-4            	     324	   3625676 ns/op	 5481090 B/op	      24 allocs/op
BenchmarkPrintImage_ThermalPreview-4    	     140	   8715682 ns/op	 5231178 B/op	  230423 allocs/op

💡 Note: Use benchstat for statistical comparison

🎯 Summary

• Total Benchmarks: 32
• Average Speed: 2612487 ns/op
• Average Memory: 2396764 B/op
• Average Allocations: 41077 allocs/op

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