feat(classifieds): green ✓ on filled required fields, drop full-form red

The :invalid CSS without scoping was making the entire form-container
draw a red border (the form is :invalid as long as any inner field is).
Removed it. Replaced with positive feedback: a green ✓ appears next to
the label of each required field as soon as it is filled. Tracks title,
category, listing_type radios and Quill description (new.html) plus
title and description (edit.html). Initial pass at load sets the check
on values restored after a POST validation error.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates/classifieds/edit.html

@@ -51,11 +51,13 @@
     .quill-container .ql-toolbar { border-top-left-radius: var(--radius); border-top-right-radius: var(--radius); }
     .quill-container .ql-container { border-bottom-left-radius: var(--radius); border-bottom-right-radius: var(--radius); font-size: var(--font-size-base); }
     .quill-container .ql-editor { min-height: 150px; }
-    .field-error, input.field-error, .quill-container.field-error {
+    input.field-error, .quill-container.field-error {
         border: 2px solid #dc2626 !important;
         box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
     }
-    :invalid:not(:focus):not(:placeholder-shown) { border: 2px solid #dc2626; }
+    .form-group.field-valid > label::after {
+        content: " ✓"; color: #16a34a; font-weight: 700; margin-left: 4px;
+    }
 
     /* Existing attachments */
     .existing-attachment { position: relative; border: 1px solid var(--border); border-radius: var(--radius); padding: var(--spacing-xs); background: var(--surface); }
@@ -192,7 +194,25 @@ quill.root.innerHTML = {{ classified.description|tojson }};
 
 (function() {
     var qc = document.getElementById('quill-editor');
-    quill.on('text-change', function() { qc && qc.classList.remove('field-error'); });
+    function setValid(g, ok) {
+        if (!g) return;
+        if (ok) { g.classList.add('field-valid'); g.classList.remove('field-error'); }
+        else g.classList.remove('field-valid');
+    }
+    var titleEl = document.getElementById('title');
+    var titleGrp = titleEl.closest('.form-group');
+    var descGrp = qc ? qc.closest('.form-group') : null;
+    function refreshTitle() { setValid(titleGrp, titleEl.value.trim().length > 0); }
+    function refreshDesc() {
+        var html = quill.root.innerHTML;
+        var ok = !(html === '<p><br></p>' || quill.getText().trim() === '');
+        setValid(descGrp, ok);
+        if (ok && qc) qc.classList.remove('field-error');
+    }
+    titleEl.addEventListener('input', refreshTitle);
+    quill.on('text-change', refreshDesc);
+    refreshTitle(); refreshDesc();
+
     document.getElementById('classifiedForm').addEventListener('submit', function(e) {
         var html = quill.root.innerHTML;
         var empty = (html === '<p><br></p>' || quill.getText().trim() === '');

templates/classifieds/new.html

@@ -25,9 +25,8 @@
     .quill-container .ql-editor {
         min-height: 150px;
     }
-    /* Highlight required fields that failed validation. Applied by server
-       on POST validation error and by client JS on Quill empty submit. */
-    .field-error,
+    /* Red border on required fields that failed validation. Applied by
+       server on POST error and by client JS on submit-with-empty Quill. */
     input.field-error,
     select.field-error,
     .type-selector.field-error,
@@ -35,9 +34,13 @@
         border: 2px solid #dc2626 !important;
         box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
     }
-    :invalid:not(:focus):not(:placeholder-shown),
-    select:invalid:not(:focus) {
-        border: 2px solid #dc2626;
+    /* Green checkmark next to label of filled required fields. JS toggles
+       .field-valid on the form-group as the user types/picks. */
+    .form-group.field-valid > label::after {
+        content: " ✓";
+        color: #16a34a;
+        font-weight: 700;
+        margin-left: 4px;
     }
     .form-container {
         max-width: 700px;
@@ -390,8 +393,47 @@ var quill = new Quill('#quill-editor', {
     // Restore from server-rendered textarea (e.g. after POST validation error)
     var initialDesc = document.getElementById('description').value;
     if (initialDesc) { quill.root.innerHTML = initialDesc; }
-    // Clear error highlight as soon as user starts typing
-    quill.on('text-change', function() { qc && qc.classList.remove('field-error'); });
+
+    // Toggle .field-valid on a .form-group based on a "is filled" check.
+    function setValid(group, ok) {
+        if (!group) return;
+        if (ok) {
+            group.classList.add('field-valid');
+            group.classList.remove('field-error');
+        } else {
+            group.classList.remove('field-valid');
+        }
+    }
+
+    var titleEl = document.getElementById('title');
+    var titleGrp = titleEl.closest('.form-group');
+    var catEl = document.getElementById('category');
+    var catGrp = catEl.closest('.form-group');
+    var radios = document.querySelectorAll('input[name="listing_type"]');
+    var radiosGrp = radios.length ? radios[0].closest('.form-group') : null;
+    var descGrp = qc ? qc.closest('.form-group') : null;
+
+    function refreshTitle() { setValid(titleGrp, titleEl.value.trim().length > 0); }
+    function refreshCat() { setValid(catGrp, catEl.value !== ''); }
+    function refreshRadios() {
+        var any = Array.from(radios).some(function(r) { return r.checked; });
+        setValid(radiosGrp, any);
+    }
+    function refreshDesc() {
+        var html = quill.root.innerHTML;
+        var ok = !(html === '<p><br></p>' || quill.getText().trim() === '');
+        setValid(descGrp, ok);
+        if (ok && qc) qc.classList.remove('field-error');
+    }
+
+    titleEl.addEventListener('input', refreshTitle);
+    catEl.addEventListener('change', refreshCat);
+    radios.forEach(function(r) { r.addEventListener('change', refreshRadios); });
+    quill.on('text-change', refreshDesc);
+
+    // Initial pass — pre-filled fields (after POST validation error) get
+    // their green check immediately on page load.
+    refreshTitle(); refreshCat(); refreshRadios(); refreshDesc();
 
     document.getElementById('classifiedForm').addEventListener('submit', function(e) {
         var html = quill.root.innerHTML;