Dnsmasq/Hosts UI tweaks, test harness: down before redeploy, exclude leases from mount

- Dnsmasq page: Config (Main config, Managed file, Config set) under Service configuration; remove Paths/Leases (in Effective config DHCP); EffectiveConfigSection collapsible groups; StatusSection flex-wrap
- Hosts: HostsFileSection always shows table; 'No host entries' in tbody when empty
- Models: reorganize into sub-namespaces (Config, EffectiveConfig, Hosts, Dhcp, Status); move EffectiveConfig/Status/Logs components under Dnsmasq
- Test harness: prepare-test-mount.sh runs 'docker compose down' before mount+up so all containers (including DHCP clients) restart; exclude testdata/leases from sync (unit tests only); testdata/README

src/DnsmasqWebUI/Components/Dnsmasq/EffectiveConfig/EffectiveConfigSection.razor.css

@@ -0,0 +1,79 @@
+/* Effective config sections – mobile-first, touch-friendly */
+.ec-sections {
+    display: flex;
+    flex-direction: column;
+    gap: 0;
+}
+
+.ec-section {
+    border-bottom: 1px solid var(--bs-border-color, #dee2e6);
+}
+
+.ec-section:last-child {
+    border-bottom: none;
+}
+
+/* Touch-friendly header: min 44px tap target (WCAG 2.5.5) */
+.ec-section-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    width: 100%;
+    min-height: 2.75rem;
+    padding: 0.4rem 0;
+    margin: 0;
+    border: none;
+    background: transparent;
+    color: inherit;
+    text-align: left;
+    cursor: pointer;
+    font-size: inherit;
+    line-height: 1.3;
+    -webkit-tap-highlight-color: transparent;
+}
+
+.ec-section-header:hover {
+    color: var(--bs-primary, #0d6efd);
+}
+
+.ec-section-header:focus-visible {
+    outline: 2px solid var(--bs-primary, #0d6efd);
+    outline-offset: 2px;
+}
+
+.ec-section-title {
+    flex: 1;
+    min-width: 0;
+}
+
+.ec-section-chevron {
+    flex-shrink: 0;
+    font-size: 0.75rem;
+    opacity: 0.7;
+    margin-left: 0.25rem;
+}
+
+.ec-section-body {
+    padding: 0.25rem 0 0.5rem 0;
+    padding-left: 0.5rem;
+    border-left: 2px solid var(--bs-border-color-translucent, rgba(0, 0, 0, 0.075));
+    overflow-wrap: break-word;
+    word-break: break-word;
+}
+
+/* Long paths/values wrap on small screens; badges stay inline */
+.ec-section-body ul {
+    overflow-wrap: break-word;
+    word-break: break-word;
+}
+
+.ec-section-body li {
+    overflow-wrap: break-word;
+    word-break: break-word;
+}
+
+@media (max-width: 767.98px) {
+    .ec-section-body {
+        padding-left: 0.35rem;
+    }
+}