v0.1.10: Improve email HTML rendering

- Strip HTML5 semantic tags (article, section, etc.) unsupported by email clients
- Strip HTML from text/plain email part to fix raw tag visibility
- Style code blocks with background color and monospace font in HTML emails
- Indent code blocks in text emails for better readability
- Strip syntax highlighting spans from code blocks

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Patch release - bug fixes and improvements

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fix: prevent duplicate emails on feed file reupload

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Add social meta tags and SVG favicon

- Add comprehensive Open Graph and Twitter Card meta tags to all templates
- Replace emoji favicon with proper SVG file from public directory
- Improve SEO with proper page descriptions

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v0.1.2 - Build improvements

- Properly inject version and commit hash into Nix builds
- Fix version output showing 'unknown (built from source)'
- Version now correctly displays as 'herald version 0.1.2 (hash)'

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v0.1.1 - UI improvements

- Add light/dark theme support with media queries
- Add mobile responsive styling
- Unify keep alive page with site template
- Improve CSS organization

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