[Frontend] Add an accessible label to the top-up amount input on stream detail

[ogazboiz]

Telegram: https://t.me/+DOylgFv1jyJlNzM0

Why this matters

The top-up amount field on the stream-detail page is an <input type="number"> with only a placeholder and no associated <label> or aria-label. Placeholder text is not an accessible name, so screen-reader users get an unlabeled number field, and the placeholder disappears once typing starts.

Verified spot

frontend/src/app/streams/[id]/page.tsx, lines ~476-482:

<input
  type="number"
  placeholder={`Amount in ${tokenSymbol}`}
  value={topUpAmount}
  onChange={(e) => setTopUpAmount(e.target.value)}
  className="..."
/>

Acceptance criteria

• Give the input an accessible name (visible <label htmlFor> or aria-label, e.g. "Top-up amount").
• Keep the placeholder as a hint only, not the sole label.
• No visual regression to the inline top-up row.

Files to touch

• frontend/src/app/streams/[id]/page.tsx

Out of scope

• The icon-only/toggle control sweep already tracked in [Frontend] Add accessible names to icon-only and toggle controls #465.

[xeladev4]

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