feat: responsive mobile layout for host rows (closes #2) (#5)

Redesigns host rows for portrait/mobile viewports (<=768px):
- Host info panel stacks on top, full width
- Sparkline renders full width below
- Each host row becomes taller to accommodate vertical layout
- Summary line wraps gracefully
- Header controls stack below title

Desktop layout is unchanged — all changes are inside a `@media (max-width: 768px)` query and CSS class hooks added to the HTML.

Closes #2

Co-authored-by: user <user@Mac.lan guest wan>
Reviewed-on: #5
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

src/main.js

@@ -1131,25 +1131,6 @@ function handleResize(state) {
 async function init() {
     log.info("NetWatch starting");
 
-    // Mobile detection — show a friendly message and bail out early
-    if (window.innerWidth < 768) {
-        const app = document.getElementById("app");
-        app.innerHTML = `
-        <div class="mx-auto px-[5%] py-8">
-          <header class="mb-8">
-            <h1 class="text-3xl font-bold text-white"><a href="https://git.eeqj.de/sneak/netwatch" target="_blank" rel="noopener" class="underline decoration-dashed decoration-gray-500 underline-offset-4">NetWatch</a> by <a href="https://sneak.berlin" target="_blank" rel="noopener" class="text-blue-400 underline hover:text-blue-300">@sneak</a></h1>
-            <p class="text-gray-400 mt-2">Real-time network connectivity monitor</p>
-          </header>
-          <div style="display:flex;align-items:center;justify-content:center;min-height:50vh;">
-            <div style="background:#1f2937;border:1px solid #374151;border-radius:12px;padding:2rem 1.5rem;text-align:center;max-width:90vw;">
-              <p style="font-size:1.25rem;color:#e5e7eb;margin:0;">Not yet available on mobile.</p>
-            </div>
-          </div>
-        </div>`;
-        log.info("Mobile viewport detected — skipping monitor startup");
-        return;
-    }
-
     // Probe common gateway IPs to find the local router
     const gateway = await detectGateway();
     const localHosts = [LOCAL_CPE];

src/styles.css

@@ -21,3 +21,96 @@ body {
         rgba(255, 255, 255, 0) 100%
     );
 }
+
+/* ---- Mobile responsive layout (portrait / narrow viewports) ---- */
+@media (max-width: 768px) {
+    /* Header: stack title and controls vertically */
+    header .flex.items-center.justify-between {
+        flex-direction: column;
+        align-items: flex-start !important;
+        gap: 1rem;
+    }
+
+    header .flex.flex-col.items-end {
+        align-items: flex-start !important;
+        flex-direction: row;
+        flex-wrap: wrap;
+        gap: 0.75rem;
+    }
+
+    /* Pause button: smaller on mobile */
+    #pause-btn {
+        padding: 0.5rem 1rem;
+    }
+
+    #pause-btn svg {
+        width: 1.25rem;
+        height: 1.25rem;
+    }
+
+    #pause-text {
+        font-size: 0.875rem;
+    }
+
+    /* Summary box: wrap into a grid for readability */
+    #summary {
+        display: flex;
+        flex-wrap: wrap;
+        gap: 0.25rem 0.5rem;
+        justify-content: center;
+        line-height: 1.6;
+    }
+
+    /* Hide the pipe separators on mobile */
+    #summary .text-gray-600.mx-3 {
+        display: none;
+    }
+
+    /* Host row: stack vertically */
+    .host-row .flex.items-center.gap-4 {
+        flex-direction: column;
+        align-items: stretch !important;
+        gap: 0.5rem;
+    }
+
+    /* Info section: full width, remove fixed width */
+    .host-row .w-\[420px\] {
+        width: 100% !important;
+        display: grid;
+        grid-template-columns: 1fr auto;
+        align-items: center;
+    }
+
+    /* Host name row with dot */
+    .host-row .flex.items-center.gap-2.min-w-\[200px\] {
+        min-width: 0;
+    }
+
+    /* Latency value: slightly smaller on mobile */
+    .host-row .latency-value {
+        font-size: 1.875rem;
+        line-height: 2.25rem;
+    }
+
+    /* Sparkline: full width below the info */
+    .host-row .sparkline-container {
+        width: 100%;
+        flex-shrink: 0;
+    }
+
+    /* Pin button: inline with the host info */
+    .host-row .pin-btn {
+        position: absolute;
+        right: 0.5rem;
+        top: 0.5rem;
+    }
+
+    .host-row {
+        position: relative;
+    }
+
+    /* Footer legend: wrap nicely */
+    footer p {
+        line-height: 1.8;
+    }
+}