fix quote form state loss, admin errors, UI polish; add seed data and playwright tests

Quote wizard _accumulated hidden inputs used double-quote attribute delimiters
which broke on tojson output containing literal " characters — all step data was
lost by step 9. Admin dashboard crashed on credit_ledger queries referencing
wrong column names (amount/entry_type vs delta/event_type). Also: opaque nav bar,
pricing card button alignment, newsletter boost replaced with card color boost,
admin CRUD for suppliers/leads, dev seed data script, and playwright quote wizard
tests.

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

CHANGELOG.md

@@ -6,6 +6,38 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Fixed
+- **Quote wizard state loss** — `_accumulated` hidden input used `"` attribute
+  delimiters which broke on `tojson` output containing literal `"` characters;
+  switched all 8 step templates to single-quote delimiters (`value='...'`)
+- **Admin dashboard crash** — `no such column: amount` in credit ledger query;
+  corrected to `delta` (the actual column name)
+- **Admin supplier detail** — credit ledger table referenced `entry.entry_type`
+  and `entry.amount` instead of `entry.event_type` and `entry.delta`
+- **Nav bar semi-transparent** — replaced `rgba(255,255,255,0.85)` +
+  `backdrop-filter: blur()` with opaque `#ffffff` background
+- **Supplier pricing card buttons misaligned** — added flexbox to `.pricing-card`
+  with `flex-grow: 1` on feature list and `margin-top: auto` on buttons
+
+### Changed
+- **Newsletter boost removed** — replaced with "Custom Card Color" boost
+  (€19/mo) across supplier pricing page, `setup_paddle.py`, and supplier
+  dashboard; directory cards with active `card_color` boost render a custom
+  border color from `supplier_boosts.metadata` JSON
+- Removed "Zillow-style" comments from `base.html` and `input.css`
+
+### Added
+- **Migration 0009** — adds `metadata TEXT` column to `supplier_boosts` for
+  card color boost configuration
+- **Admin supplier/lead CRUD** — `GET/POST /admin/suppliers/new` and
+  `GET/POST /admin/leads/new` routes with form templates; "New Supplier" and
+  "New Lead" buttons on admin list pages
+- **Dev seed data script** (`scripts/seed_dev_data.py`) — creates 5 suppliers
+  (mix of tiers), 10 leads (mix of heat scores), 1 dev user, credit ledger
+  entries, and lead forwards for local testing
+- **Playwright quote wizard tests** (`tests/test_quote_wizard.py`) — full
+  9-step flow, back-navigation data preservation, and validation error tests
+
 ### Added — Phase 2: Scale the Marketplace — Supplier Dashboard + Business Plan PDF
 
 - **Paddle.js overlay checkout** — migrated all checkout flows (billing,