feat: add lineWidth option to data modules settings

[LGLabGreg]

Applies to vertical-line, horizontal-line, rounded, and circuit-board. Defaults preserve existing rendering (1 for line/rounded, 0.5 for circuit-board). The rounded style fillets exposed outer hub corners so the rounded character is preserved at any line width. Demo gains a Line width slider and a Download PNG button.

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Project	Deployment	Actions	Updated (UTC)
reactqrcode-com	Ready	Preview, Comment	May 11, 2026 6:42pm

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Configuration used: Repository UI

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Run ID: ee64743d-0b98-4a66-9083-c3b31f17038b

📥 Commits

Reviewing files that changed from the base of the PR and between 77e9ca9 and d670548.

📒 Files selected for processing (12)

• .changeset/feat-data-modules-line-width.md
• .gitignore
• apps/docs/src/app/data-modules-settings/page.tsx
• apps/docs/src/components/demo/data-modules.tsx
• apps/docs/src/components/demo/demo.tsx
• packages/react-qr-code/src/components/data-modules.tsx
• packages/react-qr-code/src/test/data-modules-neightbours.ts
• packages/react-qr-code/src/types/lib.ts
• packages/react-qr-code/src/utils/data-modules.test.ts
• packages/react-qr-code/src/utils/data-modules.ts
• packages/react-qr-code/src/utils/settings.test.ts
• packages/react-qr-code/src/utils/settings.ts

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/line-width

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