Add dashboard PWA shell and status UX

apps/dashboard/public/icons/icon-192.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" viewBox="0 0 192 192" role="img" aria-label="EJClaw">
+  <rect width="192" height="192" rx="46" fill="#2b3726" />
+  <path d="M39 122c18 21 47 29 81 17 18-6 30-18 36-35" fill="none" stroke="#f7edda" stroke-width="14" stroke-linecap="round" />
+  <path d="M50 78c16-24 45-36 76-25 13 5 24 13 32 25" fill="none" stroke="#bf5f2c" stroke-width="14" stroke-linecap="round" />
+  <circle cx="74" cy="94" r="11" fill="#f7edda" />
+  <circle cx="118" cy="94" r="11" fill="#f7edda" />
+  <path d="M88 126h21" stroke="#f7edda" stroke-width="10" stroke-linecap="round" />
+</svg>

apps/dashboard/public/icons/icon-512.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 512 512" role="img" aria-label="EJClaw">
+  <rect width="512" height="512" rx="124" fill="#2b3726" />
+  <path d="M104 325c48 58 126 78 217 47 48-16 80-49 96-93" fill="none" stroke="#f7edda" stroke-width="38" stroke-linecap="round" />
+  <path d="M134 208c43-64 120-96 203-66 36 13 64 35 86 66" fill="none" stroke="#bf5f2c" stroke-width="38" stroke-linecap="round" />
+  <circle cx="198" cy="250" r="30" fill="#f7edda" />
+  <circle cx="314" cy="250" r="30" fill="#f7edda" />
+  <path d="M235 336h56" stroke="#f7edda" stroke-width="28" stroke-linecap="round" />
+</svg>