fix(compare): improve paragraph equality logic / reduce testdata(markdown pages)

[k1LoW]

This pull request introduces changes to improve the comparison logic in compare.go and updates multiple Markdown test data files to include a new layout metadata. The key updates include refining the equality check for paragraphs and fragments, adding a new import dependency, and appending metadata to test files for layout consistency.

Updates to compare.go:

• Enhanced paragraph comparison logic:
  • Replaced JSON marshaling with direct comparison of merged fragments, ensuring attributes like Bold, Italic, Link, and Code are checked individually. SoftLineBreak and ClassName are excluded from the comparison.
• Added strings package import:
  • Included the strings package to facilitate trimming operations during fragment comparison.

Updates to Markdown test data files:

• Added <!-- {"layout":"title-and-body"} --> metadata:
  • Standardized layout metadata across multiple test files, including testdata/autolink.md, testdata/blockquote.md, testdata/bold_and_italic.md, testdata/br.md, testdata/code.md, and others, to ensure consistent rendering in tests. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]

[github-actions]

Code Metrics Report

	main (ab90487)	#243 (e0508c7)	+/-
Coverage	35.6%	35.7%	+0.0%
Code to Test Ratio	1:0.9	1:0.9	-0.1
Test Execution Time	9s	8s	-1s

Details

  |                     | main (ab90487) | #243 (e0508c7) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          35.6% |          35.7% | +0.0% |
  |   Files             |             16 |             16 |     0 |
  |   Lines             |           2272 |           2275 |    +3 |
+ |   Covered           |            811 |            814 |    +3 |
- | Code to Test Ratio  |          1:0.9 |          1:0.9 |  -0.1 |
  |   Code              |           4606 |           4615 |    +9 |
  |   Test              |           4170 |           4170 |     0 |
+ | Test Execution Time |             9s |             8s |   -1s |

Code coverage of files in pull request scope (58.1% → 59.2%)

Files	Coverage	+/-	Status
compare.go	59.2%	+1.0%	modified

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Reported by octocov