feat: add "Co nowego" release notes banner on homepage

Shows latest version, date, one highlight feature, and count of other
changes. Links to /release-notes. Extracted _get_releases() helper
for reuse between index and release_notes routes.

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

blueprints/public/routes.py

@@ -147,6 +147,10 @@ def index():
                 MembershipApplication.status.in_(['draft', 'submitted', 'under_review', 'pending_user_approval', 'changes_requested'])
             ).first()
 
+        # Latest release for "Co nowego" banner
+        all_releases = _get_releases()
+        latest_release = all_releases[0] if all_releases else None
+
         return render_template(
             'index.html',
             companies=companies,
@@ -157,7 +161,8 @@ def index():
             next_event=next_event,
             upcoming_events=upcoming_events,
             pending_application=pending_application,
-            zopk_facts=zopk_facts
+            zopk_facts=zopk_facts,
+            latest_release=latest_release
         )
     finally:
         db.close()
@@ -827,10 +832,9 @@ def dashboard():
         db.close()
 
 
-@bp.route('/release-notes')
-def release_notes():
-    """Historia zmian platformy."""
-    releases = [
+def _get_releases():
+    """Return list of all release notes entries."""
+    return [
         {
             'version': 'v1.40.0',
             'date': '7 marca 2026',
@@ -1613,6 +1617,12 @@ def release_notes():
         },
     ]
 
+
+@bp.route('/release-notes')
+def release_notes():
+    """Historia zmian platformy."""
+    releases = _get_releases()
+
     # Statystyki (używa globalnej stałej COMPANY_COUNT_MARKETING)
     db = SessionLocal()
     try:

templates/index.html

@@ -902,6 +902,28 @@
 </div>
 {% endif %}
 
+<!-- Co nowego na platformie -->
+{% if latest_release %}
+<a href="{{ url_for('release_notes') }}" style="display: flex; align-items: center; gap: var(--spacing-md); background: var(--surface); border: 1px solid var(--border-color, #e5e7eb); border-left: 4px solid var(--primary); border-radius: var(--radius-lg); padding: var(--spacing-md) var(--spacing-lg); margin-bottom: var(--spacing-lg); text-decoration: none; color: inherit; transition: var(--transition);" onmouseover="this.style.borderLeftColor='#22c55e'; this.style.boxShadow='var(--shadow-md)'" onmouseout="this.style.borderLeftColor='var(--primary)'; this.style.boxShadow='none'">
+    <div style="font-size: 1.5rem; flex-shrink: 0;">&#10024;</div>
+    <div style="flex: 1; min-width: 0;">
+        <div style="display: flex; align-items: baseline; gap: var(--spacing-sm); flex-wrap: wrap;">
+            <span style="font-weight: 600; color: var(--text-primary);">Co nowego na platformie?</span>
+            <span style="font-size: var(--font-size-xs); color: var(--text-secondary);">{{ latest_release.version }} &middot; {{ latest_release.date }}</span>
+        </div>
+        <div style="font-size: var(--font-size-sm); color: var(--text-secondary); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;">
+            {% set highlight = (latest_release.new[0] if latest_release.new else (latest_release.improve[0] if latest_release.improve else ''))|striptags %}
+            {{ highlight }}
+            {% set total_changes = (latest_release.new|length if latest_release.new else 0) + (latest_release.improve|length if latest_release.improve else 0) + (latest_release.fix|length if latest_release.fix else 0) %}
+            {% if total_changes > 1 %}
+            <span style="color: var(--primary); font-weight: 500;">&nbsp;&middot; i {{ total_changes - 1 }} {{ 'inna zmiana' if total_changes - 1 == 1 else ('inne zmiany' if total_changes - 1 < 5 else 'innych zmian') }}</span>
+            {% endif %}
+        </div>
+    </div>
+    <span style="color: var(--primary); font-weight: 500; font-size: var(--font-size-sm); white-space: nowrap; flex-shrink: 0;">Zobacz wszystko &rarr;</span>
+</a>
+{% endif %}
+
 <!-- Event Banners - Najbliższe wydarzenia -->
 {% if upcoming_events %}
 <div class="events-row" data-animate="fadeIn">