send email after donation received

[iulusoy]

• refactor email sending so donation re-uses same actions
• type checking and improvement of donation form
• rate limiting of requests
• success / failure handling in the donation form

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

This PR refactors email sending into a shared server utility and extends the donation flow to record a donation UUID and send a confirmation email, while adding request rate limiting and improved success/failure handling in the donation UI.

Changes:

• Add donation UUID persistence + confirmation email sending with rollback behavior on send failure.
• Refactor contact form email sending to reuse shared SMTP/email utilities.
• Add Nginx rate limiting for POSTs to /contact and /donation, plus donation UI alert handling and new unit tests.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/nginx/conf/nginx.conf	Adds POST-only rate limiting for contact/donation endpoints and centralizes proxy headers.
src/frontend/src/routes/donation/page.server.test.ts	Adds unit tests covering donation action validation, DB insert, email send, and rollback paths.
src/frontend/src/routes/donation/+page.svelte	Adds submission state + localized alert handling for donation success/failure and a honeypot field.
src/frontend/src/routes/donation/+page.server.ts	Implements donation UUID generation, input validation, SMTP config validation, email confirmation, and rollback on send failure.
src/frontend/src/routes/contact/+page.server.ts	Switches contact action to shared SMTP/email utilities and structured from handling.
src/frontend/src/lib/server/schema.ts	Adds uuid column and unique index to donations table schema.
src/frontend/src/lib/server/email.ts	Introduces shared SMTP config validation, email validation helpers, and transporter creation.
src/frontend/src/lib/i18n/translations.ts	Adds donation alert translations and adds cross-locale structural type checks.
src/frontend/package.json	Adds a smoke-test Playwright script entry.

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