Remove jQuery dependency, convert to vanilla JavaScript

docs/JAVASCRIPT.md

@@ -8,17 +8,12 @@ This project minimizes JavaScript usage, preferring pure CSS solutions where pos
 - Use `<details>` elements for toggles instead of JS
 - External SDKs loaded only when payment method is enabled
 - No build step - vanilla JS only
-- jQuery used minimally (legacy, being phased out)
+- No jQuery - all vanilla JavaScript
 
 ## Static JavaScript Files
 
 Located in `make_post_sell/static/js/`:
 
-### jquery-3.6.0.min.js
-- jQuery library (legacy dependency)
-- Used by: Stripe card form, markdown preview
-- Loaded via `snippets/optional-javascript.j2` and `snippets/stripe.j2`
-
 ### qrcode.min.js
 - QRious library for QR code generation
 - Used by: Crypto checkout page
@@ -27,7 +22,7 @@ Located in `make_post_sell/static/js/`:
 ### custom.js
 - Markdown preview functionality
 - Functions: `previewAjax()`, `sendPreview()`
-- Uses jQuery for AJAX calls to `/markup-editor-preview`
+- Uses fetch API for AJAX calls to `/markup-editor-preview`
 
 ## Inline JavaScript by Template
 
@@ -43,7 +38,7 @@ Located in `make_post_sell/static/js/`:
 
 - Crypto wallets toggle (checkbox + localStorage)
 - Theme preview for shop default theme radio buttons
-- Note: Payment provider toggles now use pure CSS `<details>` elements
+- Note: Payment provider toggles use pure CSS `<details>` elements
 
 ### user_settings.j2
 **Purpose:** User theme preference sync
@@ -80,7 +75,7 @@ Located in `make_post_sell/static/js/`:
 - Loads Stripe.js SDK
 - Creates Payment Element for card input
 - Handles `stripe.confirmSetup()` flow
-- Requires jQuery
+- Uses vanilla JS with `DOMContentLoaded`
 
 ### snippets/analytics.j2
 **Purpose:** Analytics tracking (optional)
@@ -92,7 +87,7 @@ Located in `make_post_sell/static/js/`:
 ### snippets/optional-javascript.j2
 **Purpose:** Optional JS loading
 
-- Loads jQuery and custom.js async
+- Loads custom.js async
 - Used for markdown preview functionality
 
 ## External SDKs
@@ -119,6 +114,5 @@ Pages work without JavaScript where possible:
 
 ## Future Improvements
 
-- Remove jQuery dependency (replace with vanilla JS)
 - Convert remaining checkbox toggles to `<details>` elements
 - Consider removing Google Analytics option (privacy)