P0: scaffold Vite + Vue 3 + Tauri v2

- pnpm + TS + Tailwind 3 + Pinia + Vue Router with hash history
- 6 placeholder views (Status, Peers, Routes, Messages, Topics, Settings)
  rendered via lucide-icon sidebar in App.vue
- Tauri v2: shell, store, log, dialog plugins; bundle targets deb +
  appimage; sidecar wired via externalBin = binaries/mycelium
- scripts/fetch-mycelium.sh pins v0.6.1, maps musl asset onto
  gnu target triple expected by Tauri bundler
- CI: pnpm typecheck + cargo fmt/clippy/test

scripts/fetch-mycelium.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Fetches the official mycelium release binary and places it in src-tauri/binaries/
+# with the target-triple suffix expected by Tauri's externalBin bundler.
+#
+# Usage: scripts/fetch-mycelium.sh [VERSION]
+#   VERSION defaults to MYCELIUM_VERSION below.
+
+MYCELIUM_VERSION="${1:-${MYCELIUM_VERSION:-v0.6.1}}"
+REPO="threefoldtech/mycelium"
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+DEST_DIR="${ROOT_DIR}/src-tauri/binaries"
+mkdir -p "${DEST_DIR}"
+
+detect_target_triple() {
+  local arch os
+  arch="$(uname -m)"
+  os="$(uname -s | tr '[:upper:]' '[:lower:]')"
+  case "${os}-${arch}" in
+    linux-x86_64) echo "x86_64-unknown-linux-gnu" ;;
+    linux-aarch64) echo "aarch64-unknown-linux-gnu" ;;
+    *) echo "unsupported: ${os}-${arch}" >&2; exit 1 ;;
+  esac
+}
+
+# Map our target triple to the asset name pattern used by upstream releases.
+asset_for_triple() {
+  case "$1" in
+    x86_64-unknown-linux-gnu) echo "mycelium-x86_64-unknown-linux-musl.tar.gz" ;;
+    aarch64-unknown-linux-gnu) echo "mycelium-aarch64-unknown-linux-musl.tar.gz" ;;
+    *) echo "unsupported triple: $1" >&2; exit 1 ;;
+  esac
+}
+
+TRIPLE="$(detect_target_triple)"
+ASSET="$(asset_for_triple "${TRIPLE}")"
+URL="https://github.com/${REPO}/releases/download/${MYCELIUM_VERSION}/${ASSET}"
+
+TMP_DIR="$(mktemp -d)"
+trap 'rm -rf "${TMP_DIR}"' EXIT
+
+echo "→ downloading ${URL}"
+curl -fsSL "${URL}" -o "${TMP_DIR}/mycelium.tar.gz"
+
+echo "→ extracting"
+tar -xzf "${TMP_DIR}/mycelium.tar.gz" -C "${TMP_DIR}"
+
+# The archive contains a single 'mycelium' binary at the root.
+SRC="${TMP_DIR}/mycelium"
+if [[ ! -f "${SRC}" ]]; then
+  # Some releases nest the binary; find it.
+  SRC="$(find "${TMP_DIR}" -name 'mycelium' -type f -executable | head -n1)"
+fi
+if [[ -z "${SRC}" || ! -f "${SRC}" ]]; then
+  echo "could not locate mycelium binary in archive" >&2
+  exit 1
+fi
+
+DEST="${DEST_DIR}/mycelium-${TRIPLE}"
+install -m 0755 "${SRC}" "${DEST}"
+echo "✓ installed ${DEST}"
+echo "  version: ${MYCELIUM_VERSION}"
+echo "  size:    $(stat -c%s "${DEST}") bytes"