Add comprehensive SEO optimization for search engine discoverability#17

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Copilot wants to merge 7 commits intodevelopfrom

copilot/improve-website-seo

Commits on Nov 6, 2025

Initial plan
Copilot
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Add comprehensive SEO improvements: metadata, sitemap, manifest, and structured data

Copilot
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jomzxc
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Add page-specific metadata for auth, room, profile pages and custom 404 page

Copilot
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jomzxc
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Address code review feedback: fix image references and remove placeholder codes

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jomzxc
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Update metadata URLs to new domain
jomzxc
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Update website URL to https://webdrop.vercel.app

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jomzxc
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Revert to correct production URL: https://webdrop.jomszxc.tech

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jomzxc
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