A11y screen reader support

[desireddymohithreddy0925]

Description

This PR brings first-class Accessibility (a11y) Screen Reader support to TermUI! Terminal UIs have historically been black boxes to VoiceOver/NVDA. This update modifies @termuijs/core to inject semantic roles (e.g. role: 'button', ariaLabel: 'Submit Form') into the focus system.

When a widget gains focus, the framework now intelligently announces it using invisible ANSI sequences (\x1b[8m) and terminal bells (\x07). Most importantly, the render engine now executes a final sweep at the end of every frame to move the physical (hidden) terminal cursor to the exact 2D x,y coordinates of the actively focused widget, allowing spatial screen readers to track the virtual layout accurately.

Related Issue

Closes #2263

Which package(s)?

@termuijs/core

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

Screenshots / Recordings (UI changes)

Notes for the Reviewer

The cursor repositioning happens inside App.ts's requestRender() macro-task just before handing off the differential diff to the Renderer. This is critical because if it happened earlier, the VDOM frame diffs would overwrite the cursor position and park it at the bottom of the screen.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f114aaf5-3157-4c1f-b8de-ef22778bbdc0

📥 Commits

Reviewing files that changed from the base of the PR and between 65d1f7e and e2710cb.

📒 Files selected for processing (2)

• packages/core/src/a11y/index.ts
• packages/core/src/app/App.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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