fix(fees): naprawiono klik w kwadrat miesiąca (konflikt cudzysłowów w onclick)

Błąd: onclick="fn({{ name|tojson }})" — Jinja tojson generuje wartość
z cudzysłowami, które łamały atrybut HTML (zewnętrzne też cudzysłowy).
Efekt: klik w kwadrat nie robił nic.

Naprawa: przejście na data-* atrybuty + DOMContentLoaded event listener
z document.querySelectorAll. Zero escapingu, zero konfliktów.

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

templates/admin/fees.html

@@ -497,14 +497,30 @@
                         <span class="month-cell clickable {% if is_premium %}paid-premium{% else %}{{ fee.status }}{% endif %}"
                               title="{{ fee.status }}: wpłacono {{ fee.amount_paid|int }} z {{ fee.amount|int }} zł{% if underpaid %} ⚠ stawka powinna wynosić {{ expected }} zł{% endif %}{% if is_premium %} (stawka pełna 300 zł){% endif %} · Kliknij, aby edytować płatność"
                               style="position:relative;cursor:pointer;{% if underpaid %}outline:2px solid var(--error);outline-offset:-2px;{% endif %}"
-                              onclick="openPaymentModalSmart({{ cf.company.id }}, {{ cf.company.name|tojson }}, {{ year }}, {{ m }}, {{ fee.id }}, {{ fee.amount|int }}, {{ expected }}, {{ 'true' if fee.status == 'paid' else 'false' }}, {{ fee.amount_paid|int if fee.amount_paid else 0 }})">
+                              data-company-id="{{ cf.company.id }}"
+                              data-company-name="{{ cf.company.name }}"
+                              data-year="{{ year }}"
+                              data-month="{{ m }}"
+                              data-fee-id="{{ fee.id }}"
+                              data-amount="{{ fee.amount|int }}"
+                              data-expected="{{ expected }}"
+                              data-is-paid="{{ 'true' if fee.status == 'paid' else 'false' }}"
+                              data-amount-paid="{{ fee.amount_paid|int if fee.amount_paid else 0 }}">
                             {{ m }}{% if fee.status == 'partial' %}<span class="partial-badge">{{ fee.amount_paid|int }}</span>{% endif %}{% if underpaid %}<span style="position:absolute;top:-6px;right:-6px;background:var(--error);color:white;font-size:8px;font-weight:700;width:14px;height:14px;border-radius:50%;display:flex;align-items:center;justify-content:center;line-height:1;">!</span>{% endif %}
                         </span>
                         {% else %}
                         <span class="month-cell empty clickable"
                               title="Brak wpłaty za miesiąc {{ m }} (stawka {{ expected }} zł) · Kliknij, aby zarejestrować wpłatę"
                               style="cursor:pointer;"
-                              onclick="openPaymentModalSmart({{ cf.company.id }}, {{ cf.company.name|tojson }}, {{ year }}, {{ m }}, null, {{ expected }}, {{ expected }}, false, 0)">
+                              data-company-id="{{ cf.company.id }}"
+                              data-company-name="{{ cf.company.name }}"
+                              data-year="{{ year }}"
+                              data-month="{{ m }}"
+                              data-fee-id=""
+                              data-amount="{{ expected }}"
+                              data-expected="{{ expected }}"
+                              data-is-paid="false"
+                              data-amount-paid="0">
                             {{ m }}
                         </span>
                         {% endif %}
@@ -770,6 +786,28 @@ async function generateFees() {
         document.getElementById('paymentModal').classList.remove('active');
     }
 
+    // Event delegation — wszystkie klikalne kwadraciki miesięcy w widoku rocznym
+    document.addEventListener('DOMContentLoaded', function() {
+        document.querySelectorAll('.month-cell.clickable').forEach(function(cell) {
+            cell.addEventListener('click', function(ev) {
+                ev.preventDefault();
+                var d = cell.dataset;
+                var feeId = d.feeId ? parseInt(d.feeId) : null;
+                openPaymentModalSmart(
+                    parseInt(d.companyId),
+                    d.companyName,
+                    parseInt(d.year),
+                    parseInt(d.month),
+                    feeId,
+                    parseFloat(d.amount),
+                    parseFloat(d.expected),
+                    d.isPaid === 'true',
+                    parseFloat(d.amountPaid || 0)
+                );
+            });
+        });
+    });
+
     document.getElementById('paymentForm').addEventListener('submit', async function(e) {
         e.preventDefault();