Add subwatch extension

[nirgn975]

Description

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Congratulations on your new Raycast extension! 🚀

You can expect an initial review within five business days.

Once the PR is approved and merged, the extension will be available on our Store.

[greptile-apps]

PR Summary

This PR adds a new Subwatch extension for managing subscription services, with features to track, alert and optimize subscription costs through integration with the Subwatch platform.

Key issues to address:

• CHANGELOG.md has a typo in title ("ubwatch") and uses hardcoded date "2025-02-02" instead of required {PR_MERGE_DATE} template
• Hardcoded Supabase API keys and endpoints in src/state.ts and other files pose security risks and should be moved to environment variables
• Error toasts in src/manage-subscriptions.tsx and src/add-subscription.tsx incorrectly use Toast.Style.Success instead of Failure
• Missing metadata folder with screenshots despite having view commands in package.json
• Generic function name getStuff() in src/state.ts should be more descriptive like getSubscriptions()

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[greptile-apps]

PR Summary

(updates since last review)

This PR update improves the Subwatch extension with better error handling and code organization, but still has some critical issues to address.

Key points to address:

• Hardcoded API key apiKey: "123" in manage-subscriptions command context should be removed
• Hardcoded Supabase API key in preferences default value needs to be removed for security
• Redundant API_KEY and API_URL environment variables should be removed since preferences are used instead
• Missing validation for end_date being after start_date in add-subscription form
• Inconsistent date type handling between interfaces (Date objects vs strings) in types.ts

Note: Previous review already covered metadata folder, CHANGELOG formatting, and other issues that have not yet been addressed.

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