Format switch case blocks without redundant braces

[cknitt]

Summary

• Omit optional braces around multi-statement switch case bodies, matching single-expression cases.
• Keep block bodies on separate indented lines and retain braces around inner expressions.
• Update syntax snapshots and source files affected by the formatter change.

[chatgpt-codex-connector]

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Reviewed commit: b2d5e5cfdc

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.57%. Comparing base (5b00bcf) to head (73a7957).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8677   +/-   ##
=======================================
  Coverage   78.57%   78.57%           
=======================================
  Files         476      476           
  Lines       64157    64157           
=======================================
+ Hits        50413    50414    +1     
+ Misses      13744    13743    -1     

Files with missing lines	Coverage Δ
compiler/syntax/src/res_printer.ml	93.47% <100.00%> (+0.07%)	⬆️

... and 1 file with indirect coverage changes

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[pkg-pr-new]

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commit: 73a7957

[github-actions]

Developer playground preview: https://rescript-lang.github.io/rescript/dev-playground/?version=pr-8677