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Greptile Summary

This PR upgrades the Mailsy extension to the latest Raycast API/tooling, adds Windows platform support, and refactors the UI into dedicated Mail and Message components with improved loading, error, and retry states. The overall structure is clean, but there are a couple of issues worth addressing before merging.

• Changelog date placeholder: The new entry uses a hardcoded date (2026-03-18) instead of the required {PR_MERGE_DATE} template variable.
• Action.OpenInBrowser with local file paths: Both Mail.tsx and Message.tsx pass raw filesystem paths from getMessageFilePath() to Action.OpenInBrowser. On Windows (one of the stated goals of this PR), a raw path like C:\Users\...\assets\<id>.html is not a valid URL — it needs a file:// prefix to open correctly in a browser.
• Silent error swallowing in withToast: Non-Error exceptions thrown during an action are caught but never surfaced to the user, leaving them with no feedback when certain failure modes occur.

Confidence Score: 3/5

• Not safe to merge as-is — the local file path passed to Action.OpenInBrowser will likely break the "Open in Browser" action on Windows, which is the main feature addition of this PR.
• The Action.OpenInBrowser calls with raw filesystem paths are a functional regression for Windows users (the stated new platform), and the changelog date placeholder issue is a required convention violation. Both need to be fixed before merging.
• src/components/Mail.tsx and src/components/Message.tsx for the file:// URL issue; CHANGELOG.md for the date placeholder.

Important Files Changed

_{Last reviewed commit: "docs: update changel..."}

Published to the Raycast Store:
https://raycast.com/BalliAsghar/mailsy

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