templates, handlers, CSS, JS: special cakes UI, HTMX nav, dashboard overhaul

Special cakes UI: overlay drawer, basket integration, catalogue tag
filter, form parsing, JS save/edit/remove.
HTMX navigation: MainContent component, nav links with hx-get,
handlers return partial on HX-Request.
Dashboard: metrics grid, CakeBreakdown, OrderRow with status select,
CakeCounts/OrderCounts, torty filter, tort badge, results-pane.
Collapsible sidebar: toggle button, localStorage, CSS transitions.
Location field: dropdown replaced with pill toggle.
Inline style cleanup: moved to CSS classes (tag-grid, grow, icon.sm,
header-actions, toggle-group, success-icon, etc.).
Dead CSS removal: pagination, status-chip, badge-pill, login-page.
Helpers: exported CakeTitle/OrderTitle, added tagNames, tagIDsComma,
orderItemsDesc, specialCakeDetail, removed unused helpers.

server/templates/cake.templ

@@ -6,11 +6,11 @@ import (
 	"git.bronku.xyz/bronku/cake-order-tracker/models"
 )
 
-templ CakePage(cake models.Cake) {
-	@Layout(cakeTitle(cake), templ.NopComponent, CakeForm(cake))
+templ CakePage(cake models.Cake, allTags []models.Tag) {
+	@Layout(CakeTitle(cake), templ.NopComponent, CakeForm(cake, allTags))
 }
 
-templ CakeForm(cake models.Cake) {
+templ CakeForm(cake models.Cake, allTags []models.Tag) {
 	<div class="form-card">
 		<section class="card">
 			<header>
@@ -33,6 +33,21 @@ templ CakeForm(cake models.Cake) {
 					<label>Cena</label>
 					<input class="form-input" type="number" name="price" min="0" value={ cake.Price.String() }/>
 				</div>
+				<div class="form-group">
+					<label>Tagi</label>
+				<div class="tag-grid">
+					for _, t := range allTags {
+						<label class="tag-chip">
+							<input type="checkbox" name="tag" value={ strconv.Itoa(t.ID) } style="display:none"
+								if cakeHasTag(cake.Tags, t.ID) { checked }/>
+							{ t.Name }
+						</label>
+					}
+				</div>
+				<div class="horizontal-group" style="margin-top:0.375rem">
+					<input class="form-input grow" type="text" name="new_tag" placeholder="Nowy tag..."/>
+					</div>
+				</div>
 				<div class="form-actions">
 					<a href="/cakes" class="btn outline">Anuluj</a>
 					<button type="submit" class="btn primary">