style(ui): shrink open bag cards and add manual-add button to quick bar

- Reduce open bag card height from 280px to 222px
- Add a + button next to the places icon in the scan input bar
  that links to /add for manual entry

templates/partials/bag_card.html

@@ -1,6 +1,6 @@
 {% import "partials/icons.html" as icons %}
 {% macro card(bag, is_authenticated) %}
-<div id="bag-card-{{ bag.id }}" class="relative w-[45vw] md:w-[200px] h-[280px] shrink-0 snap-start rounded-lg border bg-surface p-4 flex flex-col">
+<div id="bag-card-{{ bag.id }}" class="relative w-[45vw] md:w-[200px] h-[222px] shrink-0 snap-start rounded-lg border bg-surface p-4 flex flex-col">
   {% if is_authenticated %}
   <button
     type="button"

templates/partials/scan_input.html

@@ -16,6 +16,13 @@
   >
     {{ icons::location("h-5 w-5") }}
   </a>
+  <a href="/add"
+    class="shrink-0 inline-flex items-center justify-center rounded-md border p-2.5 text-accent transition hover:bg-surface-alt"
+    title="Add manually"
+    aria-label="Add manually"
+  >
+    {{ icons::plus("h-5 w-5") }}
+  </a>
   <input
     type="text"
     name="prompt"