Workbook reflection: textarea labels aren't connected to their textareas #120

Problem

components/pr-workbook.tsx renders each reflection field (What I tried, What broke, …) through a small field component (around line 665). It shows the label text in a <label> or <span>, but the <textarea> (line ~677) isn't linked to it.

Done when

• The field component links its label to the textarea (useId() + htmlFor/id), so all five fields are named at once.
• The word-count hint is linked with aria-describedby.

Test with your OS screen reader (VoiceOver: Cmd+F5 on macOS, Narrator on Windows) or Chrome DevTools → Elements → Accessibility pane: the control must announce a meaningful name.

Size: ~2–10 lines.

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