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>

3 files changed, 148 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}}
diff --git a/web/templates/shopping-mode.html b/web/templates/shopping-mode.html
new file mode 100644
index 0000000..9e21ac6
--- /dev/null
+++ b/web/templates/shopping-mode.html
@@ -0,0 +1,93 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
+    <title>{{.StoreName}} - Shopping</title>
+    <link rel="icon" type="image/svg+xml" href="/static/favicon.svg">
+    <link rel="stylesheet" href="/static/css/output.css">
+    <script src="/static/js/htmx.min.js"></script>
+    <style>
+        body {
+            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
+            min-height: 100vh;
+            margin: 0;
+            padding: 0;
+        }
+        .item-row {
+            transition: all 0.2s ease;
+        }
+        .item-row:active {
+            transform: scale(0.98);
+            background: rgba(255,255,255,0.15);
+        }
+        .item-checked {
+            opacity: 0.5;
+        }
+        .item-checked .item-name {
+            text-decoration: line-through;
+            color: rgba(255,255,255,0.4);
+        }
+        .store-switcher {
+            scrollbar-width: none;
+            -ms-overflow-style: none;
+        }
+        .store-switcher::-webkit-scrollbar {
+            display: none;
+        }
+    </style>
+</head>
+<body class="text-white">
+    <!-- Header -->
+    <header class="sticky top-0 z-50 bg-black/40 backdrop-blur-lg border-b border-white/10">
+        <div class="flex items-center justify-between px-4 py-3">
+            <a href="/?tab=shopping" class="text-white/70 hover:text-white p-2 -ml-2">
+                <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"></path>
+                </svg>
+            </a>
+            <h1 class="text-lg font-semibold">{{.StoreName}}</h1>
+            <div class="w-10"></div>
+        </div>
+
+        <!-- Store Switcher -->
+        {{if gt (len .StoreNames) 1}}
+        <div class="store-switcher flex gap-2 px-4 pb-3 overflow-x-auto">
+            {{range .StoreNames}}
+            <a href="/shopping/mode/{{.}}"
+               class="px-3 py-1.5 rounded-full text-sm whitespace-nowrap transition-colors
+                      {{if eq . $.StoreName}}bg-white/20 text-white{{else}}bg-white/5 text-white/60 hover:bg-white/10{{end}}">
+                {{.}}
+            </a>
+            {{end}}
+        </div>
+        {{end}}
+    </header>
+
+    <!-- Items List -->
+    <main class="p-4" id="shopping-items">
+        {{template "shopping-mode-items" .}}
+    </main>
+
+    <!-- Quick Add Form (Fixed at Bottom) -->
+    <div class="fixed bottom-0 left-0 right-0 bg-black/60 backdrop-blur-lg border-t border-white/10 p-4">
+        <form hx-post="/shopping/add"
+              hx-target="#shopping-items"
+              hx-swap="innerHTML"
+              hx-on::after-request="this.reset()"
+              class="flex gap-2">
+            <input type="hidden" name="store" value="{{.StoreName}}">
+            <input type="hidden" name="mode" value="shopping-mode">
+            <input type="text" name="name" placeholder="Add item..."
+                   class="flex-1 bg-white/10 border border-white/20 rounded-lg px-4 py-3 text-white placeholder-white/40 focus:outline-none focus:ring-2 focus:ring-white/30"
+                   required autocomplete="off">
+            <button type="submit" class="bg-white/20 hover:bg-white/30 text-white px-5 py-3 rounded-lg font-medium transition-colors">
+                Add
+            </button>
+        </form>
+    </div>
+
+    <!-- Spacer for fixed bottom form -->
+    <div class="h-24"></div>
+</body>
+</html>