[codex] Keep Read controls visible and restore sentence selection

[Talljack]

What changed

• keep the Read practice workspace within the remaining viewport
• make long reference text scroll inside its card while controls remain visible below it
• render read-aloud words as selectable text while preserving click and keyboard pronunciation
• handle pointer and native selection completion reliably
• extract sentence context across rendered text nodes
• deduplicate selection events so one selection sends one translation request

Root cause

The long article card had no height boundary, so it pushed the controls below the entire document. Read-aloud mode also rendered every word as a separate native button, which prevented reliable sentence selection. The selection provider then handled selectionchange and pointerup twice for the same range.

Validation

• full pnpm test suite
• pnpm typecheck
• pnpm lint
• pnpm build
• browser-tested desktop and 390x844 mobile layouts
• verified long content scrolls internally with page scroll at zero
• verified a complete 30-word sentence selection and Chinese translation
• verified one translation request per selection

[vercel]

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Project	Deployment	Actions	Updated (UTC)
echo-type	Ready	Preview, Comment	Jul 15, 2026 2:20pm