fix: improve RTL rendering for paragraphs, quotes, and lists

[ammahmoudi]

This PR improves RTL (Arabic/Persian) readability by making direction handling paragraph-level, similar to how Telegram handles mixed-direction text. It aims to be minimal and localized, affecting only text rendering surfaces.

Changes:

• Message bodies: apply Unicode bidi handling so each paragraph’s direction resolves naturally (RTL/LTR mixing behaves correctly).
• Formatted/markdown HTML: ensure block elements (paragraphs, blockquotes, lists, list items) get direction applied so quote gutters and list markers/indentation appear on the correct side in RTL.
• Room topic surfaces: apply the same bidi behavior for topic previews/viewers.

Commits:

• Fix bidi direction for RTL paragraphs
• Fix RTL markers for markdown quotes and lists

[github-actions]

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[ammahmoudi]

I have read the CLA Document and I hereby sign the CLA

[ammahmoudi]

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You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.

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[ammahmoudi]

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[Behzad9]

We Persian/Arabic users are eagerly waiting for these features to be added in the next update of the Cinny. These features are a necessity for Cinny and we thank you for providing them.