chore: commit pending changes — logo, base template, scratch designs, changelog

- favicon.svg: pending logo tweaks
- base.html: pending template changes
- CHANGELOG.md: add waitlist mode and logo redesign entries missed in prior commits
- scratch/: add design prototype HTML/JSX files, remove old markdown notes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -9,6 +9,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Changed
 - Auto-create Resend audiences per blueprint: `capture_waitlist_email()` now derives the audience name from `request.blueprints[0]` (e.g., `waitlist-auth`, `waitlist-suppliers`) and lazily creates audiences via the Resend API on first use, caching IDs in a new `resend_audiences` table; removes `RESEND_AUDIENCE_WAITLIST` env var — only `RESEND_API_KEY` needed
 
+### Added
+- Waitlist mode (lean startup smoke test): `WAITLIST_MODE` config flag intercepts `/auth/signup`, `/suppliers/signup`, and `/planner/export` to capture emails or show "coming soon" messaging before Paddle billing is ready; confirmation emails sent via Resend; optional `RESEND_AUDIENCE_WAITLIST` for bulk launch blast; flip flag to `false` and all flows revert to normal
+
+### Changed
+- Redesign padel racket SVG logo/favicon: filled dark silhouette with white punched-through holes (3×3 grid), proper throat tapering to handle at bottom, grip tape lines — replaces outline-only stroke approach; bump favicon cache to v4
+
 ### Added
 - Simple A/B testing with `@ab_test` decorator and Umami `data-tag` integration
 - SEO defaults in `base.html`: canonical, og:url, og:type, og:image (logo fallback), og:title, og:description, twitter:card — every page gets these automatically, child templates override as needed