Feature/responsive grid

[desireddymohithreddy0925]

Description

This PR introduces the highly requested breakpoint-based responsive Grid and Col components, making dashboard building across multiple terminal dimensions seamless.

It works natively alongside the existing LayoutEngine by checking grid container widths and mapping the appropriate breakpoints (sm, md, lg) down to Col components, mapping them gracefully to dynamically adjusting gridColumnEnd: 'span N' logic instantly on resize events.

Related Issue

Closes #2265

Which package(s)?

@termuijs/widgets

Type of Change

• 🐛 Bug fix (type:bug)
• ✨ Feature (type:feature)
• 📝 Docs (type:docs)
• 🧪 Tests (type:testing)
• ♻️ Refactor (type:refactor)
• 🎨 Design / UX (type:design)
• ♿ Accessibility (type:accessibility)
• ⚡ Performance (type:performance)
• 🔧 DevOps / CI (type:devops)
• 🔒 Security (type:security)

Checklist

• ⭐ You starred the repo. The needs-star check blocks your merge otherwise.
• Tests pass locally: bun vitest run
• Build passes: bun run build
• Typecheck passes: bun run typecheck
• You read CONTRIBUTING.md.
• Your PR title follows type: short description.
• Widget state mutators call markDirty() (if your change affects rendering).
• No new any types without an inline comment explaining why.
• No unrelated refactors bundled into this PR.

GSSoC 2026 Participation

• You are a GSSoC 2026 contributor.
• Your GSSoC profile: https://gssoc.girlscript.org/profile/YOUR_PROFILE_ID_HERE

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a7ed6958-18c6-4e57-9ed1-64edce4ce096

📥 Commits

Reviewing files that changed from the base of the PR and between 65d1f7e and de3fc99.

📒 Files selected for processing (4)

• packages/widgets/src/index.ts
• packages/widgets/src/layout/Col.ts
• packages/widgets/src/layout/Grid.test.ts
• packages/widgets/src/layout/Grid.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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