Add shopping mode for focused single-store shopping (#34)

- Full-screen view for one store at a time
- Tap items to toggle completion
- Completed items greyed and sorted to bottom
- Quick-add form at bottom of screen
- Store switcher pills for easy navigation
- "Shop" button on each store in shopping tab

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2 files changed, 55 insertions, 1 deletions

diff --git a/web/templates/partials/shopping-mode-items.html b/web/templates/partials/shopping-mode-items.html
new file mode 100644
index 0000000..fdf0674
--- /dev/null
+++ b/web/templates/partials/shopping-mode-items.html
@@ -0,0 +1,45 @@
+{{define "shopping-mode-items"}}
+<div class="space-y-2">
+    {{if .Items}}
+    {{range .Items}}
+    <div class="item-row flex items-center gap-3 p-4 bg-white/5 rounded-xl border border-white/10 cursor-pointer {{if .Checked}}item-checked{{end}}"
+         hx-post="/shopping/mode/{{$.StoreName}}/toggle"
+         hx-vals='{"id":"{{.ID}}","source":"{{.Source}}","checked":{{if .Checked}}false{{else}}true{{end}}}'
+         hx-target="#shopping-items"
+         hx-swap="innerHTML">
+
+        <!-- Checkbox visual -->
+        <div class="w-6 h-6 rounded-full border-2 flex items-center justify-center flex-shrink-0
+                    {{if .Checked}}bg-green-500/30 border-green-500{{else}}border-white/30{{end}}">
+            {{if .Checked}}
+            <svg class="w-4 h-4 text-green-400" fill="currentColor" viewBox="0 0 20 20">
+                <path fill-rule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clip-rule="evenodd"></path>
+            </svg>
+            {{end}}
+        </div>
+
+        <!-- Item content -->
+        <div class="flex-1 min-w-0">
+            <span class="item-name text-white block">{{.Name}}</span>
+            {{if .Quantity}}
+            <span class="text-sm text-white/50">{{.Quantity}}</span>
+            {{end}}
+        </div>
+
+        <!-- Source badge -->
+        <span class="text-xs px-2 py-0.5 rounded flex-shrink-0
+                    {{if eq .Source "trello"}}bg-blue-900/50 text-blue-300
+                    {{else if eq .Source "user"}}bg-purple-900/50 text-purple-300
+                    {{else}}bg-green-900/50 text-green-300{{end}}">
+            {{.Source}}
+        </span>
+    </div>
+    {{end}}
+    {{else}}
+    <div class="text-center py-16 text-white/50">
+        <p class="text-lg mb-2">No items</p>
+        <p class="text-sm">Add items using the form below</p>
+    </div>
+    {{end}}
+</div>
+{{end}}
diff --git a/web/templates/partials/shopping-tab.html b/web/templates/partials/shopping-tab.html
index f247f3d..4d0ac02 100644
--- a/web/templates/partials/shopping-tab.html
+++ b/web/templates/partials/shopping-tab.html
@@ -29,7 +29,16 @@
     {{if .Stores}}
     {{range .Stores}}
     <section class="bg-panel backdrop-blur-sm rounded-xl p-4 sm:p-5">
-        <h2 class="text-xl font-medium mb-4 text-white">{{.Name}}</h2>
+        <div class="flex items-center justify-between mb-4">
+            <h2 class="text-xl font-medium text-white">{{.Name}}</h2>
+            <a href="/shopping/mode/{{.Name}}"
+               class="px-3 py-1.5 bg-white/10 hover:bg-white/20 rounded-lg text-sm text-white/70 hover:text-white transition-colors flex items-center gap-1.5">
+                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 3h2l.4 2M7 13h10l4-8H5.4M7 13L5.4 5M7 13l-2.293 2.293c-.63.63-.184 1.707.707 1.707H17m0 0a2 2 0 100 4 2 2 0 000-4zm-8 2a2 2 0 11-4 0 2 2 0 014 0z"></path>
+                </svg>
+                Shop
+            </a>
+        </div>
         {{range .Categories}}
         <div class="mb-4 last:mb-0">
             {{if .Name}}<h3 class="text-sm text-white/60 mb-2 uppercase tracking-wide">{{.Name}}</h3>{{end}}