blocked dates page and warning for special-cake orders

Add blocked_date table (migration 5), model, and store CRUD methods.
Add management page at /blocked with add/delete functionality.
Add nav link 'Terminy zablokowane' with event_busy icon.
Pass blocked dates to order form as JSON data attribute.
On form submit, if the order has special cakes and the date is
blocked, show a confirm() dialog warning the user.

server/templates/blocked.templ

@@ -0,0 +1,44 @@
+package templates
+
+import (
+	"strconv"
+
+	"git.bronku.xyz/bronku/cake-order-tracker/models"
+)
+
+templ BlockedPage(blocked []models.BlockedDate) {
+	@Layout("Terminy zablokowane", templ.NopComponent, BlockedMain(blocked))
+}
+
+templ BlockedMain(blocked []models.BlockedDate) {
+	<section class="card" style="max-width:30rem">
+		<header>
+			<h2>
+				<span class="material-symbols-outlined">block</span>
+				Terminy zablokowane
+			</h2>
+		</header>
+		<div>
+			<form method="POST" action="/blocked" class="horizontal-group" style="gap:0.5rem;margin-bottom:1rem">
+				<input type="date" name="date" required class="form-input" style="width:auto"/>
+				<button type="submit" class="btn primary">Zablokuj</button>
+			</form>
+			if len(blocked) == 0 {
+				<p class="text-muted" style="text-align:center;padding:1rem 0">Brak zablokowanych terminów</p>
+			} else {
+				<ul class="breakdown-list">
+					for _, b := range blocked {
+						<li class="breakdown-item">
+							<span>{ b.Date }</span>
+							<form method="POST" action={ templ.URL("/blocked/" + strconv.Itoa(b.ID) + "/delete") } style="display:inline">
+								<button type="submit" class="action-btn" title="Usuń">
+									<span class="material-symbols-outlined">close</span>
+								</button>
+							</form>
+						</li>
+					}
+				</ul>
+			}
+		</div>
+	</section>
+}

server/templates/helpers.go

@@ -1,6 +1,7 @@
 package templates
 
 import (
+	"encoding/json"
 	"fmt"
 	"strconv"
 	"strings"
@@ -73,6 +74,15 @@ func orderItemsDesc(order models.Order) string {
 	return desc
 }
 
+func blockedDatesJSON(dates []models.BlockedDate) string {
+	names := make([]string, len(dates))
+	for i, d := range dates {
+		names[i] = d.Date
+	}
+	b, _ := json.Marshal(names)
+	return string(b)
+}
+
 func orderScript(order models.Order) string {
 	var b strings.Builder
 	b.WriteString("<script>")

server/templates/nav.templ

@@ -10,18 +10,22 @@ templ Nav() {
 			<p>Tracker</p>
 		</div>
 	</div>
-	<a href="/order" class="cta" hx-get="/order" hx-target="#main" hx-push-url="true">
+	<a href="/order" class="cta" hx-get="/order" hx-target="#main" hx-swap="outerHTML" hx-push-url="true">
 		<span class="material-symbols-outlined">add</span>
 		<span>Nowe zamówienie</span>
 	</a>
 	<nav>
-		<a href="/orders" class="link" hx-get="/orders" hx-target="#main" hx-push-url="true">
+		<a href="/orders" class="link" hx-get="/orders" hx-target="#main" hx-swap="outerHTML" hx-push-url="true">
 			<span class="material-symbols-outlined">dashboard</span>
 			<span>Panel główny</span>
 		</a>
-		<a href="/cakes" class="link" hx-get="/cakes" hx-target="#main" hx-push-url="true">
+		<a href="/cakes" class="link" hx-get="/cakes" hx-target="#main" hx-swap="outerHTML" hx-push-url="true">
 			<span class="material-symbols-outlined">inventory_2</span>
 			<span>Katalog</span>
 		</a>
+		<a href="/blocked" class="link" hx-get="/blocked" hx-target="#main" hx-swap="outerHTML" hx-push-url="true">
+			<span class="material-symbols-outlined">event_busy</span>
+			<span>Terminy zablokowane</span>
+		</a>
 	</nav>
 }

server/templates/order.templ

@@ -6,12 +6,12 @@ import (
 	"git.bronku.xyz/bronku/cake-order-tracker/models"
 )
 
-templ OrderPage(order models.Order, catalogue []models.Cake, allTags []models.Tag) {
-	@Layout(OrderTitle(order), templ.NopComponent, OrderForm(order, catalogue, allTags))
+templ OrderPage(order models.Order, catalogue []models.Cake, allTags []models.Tag, blockedDates []models.BlockedDate) {
+	@Layout(OrderTitle(order), templ.NopComponent, OrderForm(order, catalogue, allTags, blockedDates))
 }
 
-templ OrderForm(order models.Order, catalogue []models.Cake, allTags []models.Tag) {
-	<form method="post" class="split-pane">
+templ OrderForm(order models.Order, catalogue []models.Cake, allTags []models.Tag, blockedDates []models.BlockedDate) {
+	<form method="post" class="split-pane" onsubmit="return confirmBlockedDate(this)" data-blocked-dates={ blockedDatesJSON(blockedDates) }>
 		<input type="hidden" name="id" value={ strconv.Itoa(order.ID) }/>
 		<div class="order-left">
 			<section class="card">