Add household support: multi-household isolation, each with own admin and users, 38 tests

static/style.css

@@ -36,6 +36,7 @@ body {
 }
 .brand { font-size: 1.2rem; font-weight: 700; }
 .nav-right { display: flex; align-items: center; gap: 12px; }
+.nav-household { font-weight: 600; font-size: 0.85rem; color: var(--primary); background: #e3f2fd; padding: 2px 10px; border-radius: 12px; }
 .nav-user { font-weight: 500; color: var(--muted); }
 
 /* ── Buttons ── */
@@ -65,9 +66,10 @@ body {
     border: 1px solid var(--border);
     border-radius: var(--radius);
     padding: 32px;
-    max-width: 380px;
+    max-width: 420px;
     margin: 40px auto;
 }
+.register-card { max-width: 480px; }
 .form-card h2 { margin-bottom: 20px; }
 .form-card label { display: block; margin: 12px 0 4px; font-weight: 500; font-size: 0.9rem; }
 .form-card input[type="text"],
@@ -81,6 +83,40 @@ body {
 .form-card button[type="submit"] { margin-top: 20px; width: 100%; }
 .form-footer { margin-top: 16px; text-align: center; font-size: 0.85rem; color: var(--muted); }
 
+/* Household section */
+.household-section {
+    border: 1px solid var(--border);
+    border-radius: var(--radius);
+    padding: 16px;
+    margin: 16px 0;
+}
+.household-section legend {
+    font-weight: 600;
+    font-size: 0.9rem;
+    padding: 0 8px;
+}
+.radio-label {
+    display: flex !important;
+    align-items: center;
+    gap: 8px;
+    margin: 12px 0 4px !important;
+    cursor: pointer;
+    font-weight: 400 !important;
+}
+.radio-label input[type="radio"] { margin: 0; }
+.household-block {
+    margin: 4px 0 12px 24px;
+}
+.select-input, .text-input {
+    width: 100%;
+    padding: 8px 12px;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    font-size: 1rem;
+    background: var(--surface);
+}
+.hint { font-size: 0.8rem; color: var(--muted); margin-top: 4px; }
+
 /* ── Flashes ── */
 .flashes { margin-bottom: 16px; }
 .flash {