Add word-by-word reading option for bonuses

[Copilot]

In actual quizbowl matches, bonuses are read aloud word by word. This adds a toggle to read bonus leadins and parts one word at a time, with a dead time timer after each part completes before the answer period begins — matching the tossup reading UX.

Changes

• quizbowl/BonusRoom.js — readBonus() method mirroring readTossup() from TossupRoom.js. Reads leadin then each part word-by-word, auto-starts answer period after each part finishes. Added pauseBonus(), setReadingSpeed(), toggleReadBonuses(). State variables prefixed with bonus to avoid collision with tossup state in TossupBonusRoom.
• client/play/BonusClient.js — updateQuestion() handler targeting either #leadin or #bonus-part-{N} based on target field. Smart fallthrough: only handles update-question when data.target is set, so tossup word updates pass through to TossupClientMixin in combined rooms.
• client/play/bonuses/index.html — "Read bonuses word by word" toggle, reading speed slider (hidden when off), Pause button.
• client/play/bonuses/index.jsx — Event wiring, p keyboard shortcut for pause, localStorage persistence for new settings.
• client/play/bonuses/SoloBonusClient.js — Settings persistence overrides.

UI

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add option for bonuses to be read out like toss-ups</issue_title>
<issue_description>When one is in an actual quizbowl match, the bonuses would be read out word for word, giving a chance for the players to think. To help mimic the conditions of a quizbowl match, it would help if there was an option for the words in bonuses to be displayed one by one and for there to be a timer that starts immediately after all words have been displayed.</issue_description>

<agent_instructions>Look at the readTossup function in TossupRoom.js for how the actual logic of reading the bonuses should be implemented</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Add option for bonuses to be read out like toss-ups #392

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