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fix(cli): prevent flash of raw composition content before runtime mounts - #3

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watanabefam wants to merge 3 commits into
minicoursegenerator:mainfrom
watanabefam:fix/flash-of-unstyled-content
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fix(cli): prevent flash of raw composition content before runtime mounts#3
watanabefam wants to merge 3 commits into
minicoursegenerator:mainfrom
watanabefam:fix/flash-of-unstyled-content

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The stripFallback function removed CSS rules referencing [data-erp-fallback], which included the :not([data-erp-fallback]) rule that hides raw content. This caused a flash of unstyled XML before the runtime mounted.

Now preserves the :not(...) rule and adds a generic 'edu-role-play > * { display: none !important; }' rule to hide all raw content until the runtime creates the shadow DOM.

The chat auto-scrolled to the bottom on every message render,
making it impossible to scroll up and read earlier messages
while the conversation was ongoing.

Now only auto-scrolls if the user is within 60px of the bottom.
If they've scrolled up to read history, their position is respected.
…or reliable scroll

justify-content: flex-end causes inconsistent scrollTop behavior across
browsers when combined with overflow-y: auto. Replaced it with
margin-top: auto on the inner container, which pushes messages to the
bottom naturally while keeping scroll position math consistent.

Also added overflow-x: hidden, overscroll-behavior: contain, and
scroll-behavior: smooth for a more reliable scroll experience.
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