feat: add area management — list, add, edit, delete locations

Adds /locations/ page with full CRUD for plant areas. Edit redirects
to dedicated form; delete unlinks plants and shows confirm dialog if
area has plants. Gear icon in plant list filter bar links to management.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plants/templates/plants/location_edit.html

@@ -0,0 +1,21 @@
+{% extends "plants/base.html" %}
+{% block title %}Edit Area — BloomBase{% endblock %}
+{% block content %}
+
+<div class="d-flex align-items-center gap-2 mb-3">
+    <a href="{% url 'location_list' %}" class="btn btn-sm btn-outline-secondary">←</a>
+    <h5 class="mb-0 flex-grow-1">Edit area</h5>
+</div>
+
+<form method="post">
+    {% csrf_token %}
+    <div class="mb-3">
+        <input type="text" name="name" value="{{ location.name }}" class="form-control" required autofocus>
+    </div>
+    <div class="d-flex gap-2">
+        <button type="submit" class="btn btn-success">Save</button>
+        <a href="{% url 'location_list' %}" class="btn btn-outline-secondary">Cancel</a>
+    </div>
+</form>
+
+{% endblock %}

plants/templates/plants/locations.html

@@ -0,0 +1,36 @@
+{% extends "plants/base.html" %}
+{% block title %}Areas — BloomBase{% endblock %}
+{% block content %}
+
+<div class="d-flex align-items-center gap-2 mb-3">
+    <a href="{% url 'plant_list' %}" class="btn btn-sm btn-outline-secondary">←</a>
+    <h5 class="mb-0 flex-grow-1">Areas</h5>
+</div>
+
+<div class="list-group mb-3">
+{% for loc in locations %}
+<div class="list-group-item d-flex justify-content-between align-items-center py-2">
+    <span>{{ loc.name }} <small class="text-muted">{{ loc.plant_count }} plant{{ loc.plant_count|pluralize }}</small></span>
+    <div class="d-flex gap-1">
+        <a href="{% url 'location_edit' loc.pk %}" class="btn btn-sm btn-outline-secondary py-0 px-2">✏️</a>
+        <form method="post" action="{% url 'location_delete' loc.pk %}"
+              onsubmit="return {% if loc.plant_count %}confirm('{{ loc.name|escapejs }} has {{ loc.plant_count }} plant{{ loc.plant_count|pluralize }}. Their area will be cleared. Delete anyway?'){% else %}true{% endif %}">
+            {% csrf_token %}
+            <button type="submit" class="btn btn-sm btn-outline-danger py-0 px-2">✕</button>
+        </form>
+    </div>
+</div>
+{% empty %}
+<div class="list-group-item text-muted">No areas yet.</div>
+{% endfor %}
+</div>
+
+<form method="post">
+    {% csrf_token %}
+    <div class="d-flex gap-2">
+        <input type="text" name="name" class="form-control form-control-sm" placeholder="New area name" required>
+        <button type="submit" class="btn btn-sm btn-success text-nowrap">+ Add</button>
+    </div>
+</form>
+
+{% endblock %}

plants/templates/plants/plant_list.html

@@ -18,12 +18,15 @@
     >
 </div>
 
-<div class="btn-group w-100 mb-3 flex-wrap" role="group">
+<div class="d-flex align-items-center gap-2 mb-3">
+    <div class="btn-group flex-wrap flex-grow-1" role="group">
         <a href="{% url 'plant_list' %}" class="btn btn-sm {% if not location_filter %}btn-success{% else %}btn-outline-success{% endif %}">All</a>
         {% for loc in locations %}
         <a href="{% url 'plant_list' %}?location={{ loc.pk }}" class="btn btn-sm {% if location_filter == loc.pk|stringformat:'s' %}btn-success{% else %}btn-outline-success{% endif %}">{{ loc.name }}</a>
         {% endfor %}
     </div>
+    <a href="{% url 'location_list' %}" class="btn btn-sm btn-outline-secondary flex-shrink-0" title="Manage areas">⚙️</a>
+</div>
 
 <div id="plant-list">
     {% include "plants/partials/plant_list_results.html" %}

plants/urls.py

@@ -1,5 +1,5 @@
 from django.urls import path
-from plants.views import dashboard, plants, pruning, species, identify
+from plants.views import dashboard, plants, pruning, species, identify, locations
 
 urlpatterns = [
     path('', dashboard.dashboard, name='dashboard'),
@@ -22,6 +22,9 @@ urlpatterns = [
     path('photos/<int:photo_pk>/set-thumbnail/', plants.set_thumbnail, name='set_thumbnail'),
     path('photos/<int:photo_pk>/delete/', plants.delete_photo, name='delete_photo'),
     path('pruning/', pruning.pruning_calendar, name='pruning_calendar'),
+    path('locations/', locations.location_list, name='location_list'),
+    path('locations/<int:pk>/edit/', locations.location_edit, name='location_edit'),
+    path('locations/<int:pk>/delete/', locations.location_delete, name='location_delete'),
     path('species/search/', species.species_search, name='species_search'),
     path('species/select/', species.species_select, name='species_select'),
     path('species/select/vpc/', species.vpc_select, name='vpc_select'),

plants/views/locations.py

@@ -0,0 +1,34 @@
+from django.shortcuts import render, get_object_or_404, redirect
+from django.views.decorators.http import require_POST
+from django.db.models import Count
+from plants.models import Location, Plant
+
+
+def location_list(request):
+    if request.method == 'POST':
+        name = request.POST.get('name', '').strip()
+        if name:
+            Location.objects.get_or_create(name=name)
+        return redirect('location_list')
+
+    locations = Location.objects.annotate(plant_count=Count('plants'))
+    return render(request, 'plants/locations.html', {'locations': locations})
+
+
+def location_edit(request, pk):
+    location = get_object_or_404(Location, pk=pk)
+    if request.method == 'POST':
+        name = request.POST.get('name', '').strip()
+        if name:
+            location.name = name
+            location.save()
+        return redirect('location_list')
+    return render(request, 'plants/location_edit.html', {'location': location})
+
+
+@require_POST
+def location_delete(request, pk):
+    location = get_object_or_404(Location, pk=pk)
+    Plant.objects.filter(location=location).update(location=None)
+    location.delete()
+    return redirect('location_list')