Migrate playground from CodeMirror v5 to v6 with native ReScript implementation#1119

Draft

Copilot wants to merge 10 commits intomasterfrom

copilot/migrate-playground-to-cm-v6

Commits on Oct 12, 2025

Initial plan
Copilot
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Migrate CodeMirror from v5 to v6 - initial implementation

Copilot
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tsnobip
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Fix warnings and remove CodeMirror v5 dependency

Copilot
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tsnobip
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Address code review feedback - fix import paths, error handling, and add documentation

Copilot
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tsnobip
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Fix error validation logic - properly validate both line and column bounds

Copilot
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tsnobip
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Clarify error position indexing in comments - rows are 1-based, columns are 0-based

Copilot
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tsnobip
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