Improve shopping mode and flatten nav bar

Shopping mode:
- Click to complete items (deletes user items, hides external items)
- Add print button with compact two-column print layout
- Fix CSRF token for HTMX requests
- Fix input clearing with proper htmx:afterRequest handler
- Remove "Quick Add" store option, require valid store

Navigation:
- Replace dropdown menu with flat nav showing all tabs
- Remove unused dropdown JS

Tests:
- Add TestHandleShoppingModeComplete for user and external items

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

1 files changed, 1 insertions, 2 deletions

diff --git a/web/templates/partials/shopping-tab.html b/web/templates/partials/shopping-tab.html
index e5fa3e6..0b22c15 100644
--- a/web/templates/partials/shopping-tab.html
+++ b/web/templates/partials/shopping-tab.html
@@ -33,8 +33,7 @@
             <input type="text" name="name" placeholder="Add item..."
                    class="flex-1 bg-white/10 border border-white/20 rounded-lg px-3 py-2 text-white placeholder-white/40 focus:outline-none focus:ring-2 focus:ring-white/30 text-sm"
                    required>
-            <select name="store" class="bg-white/10 border border-white/20 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:ring-2 focus:ring-white/30">
-                <option value="Quick Add">Quick Add</option>
+            <select name="store" class="bg-white/10 border border-white/20 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:ring-2 focus:ring-white/30" required>
                 {{range .Stores}}
                 <option value="{{.Name}}">{{.Name}}</option>
                 {{end}}