Adds favicon and manifest

Adds favicon and web manifest to improve the app's installability and appearance as a Progressive Web App (PWA).

Also adds `.gitignore` entries for the parser output directories.

public/favicon.svg

@@ -0,0 +1,50 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+    <style>
+        path,
+        circle {
+            stroke-width: 1.5;
+        }
+
+        .bg {
+            fill: #ffffff;
+            stroke: #3b82f6;
+        }
+
+        .icon {
+            fill: #3b82f6;
+            stroke: #3b82f6;
+        }
+
+        .text {
+            fill: #3b82f6;
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
+            font-weight: bold;
+            font-size: 13px;
+        }
+
+        @media (prefers-color-scheme: dark) {
+            .bg {
+                fill: #1e3a8a;
+                stroke: #93c5fd;
+            }
+
+            .icon {
+                fill: #93c5fd;
+                stroke: #93c5fd;
+            }
+
+            .text {
+                fill: #93c5fd;
+            }
+        }
+    </style>
+
+    <!-- Background circle -->
+    <circle cx="16" cy="16" r="14" class="bg" />
+
+    <!-- Dashboard chart-like icon -->
+    <path d="M10,22 L10,16 L13,16 L13,22 Z M15,22 L15,12 L18,12 L18,22 Z M20,22 L20,14 L23,14 L23,22 Z" class="icon" />
+
+    <!-- Text "LD" for LiveDash -->
+    <text x="9.5" y="10" class="text">LD</text>
+</svg>