UI changes to update and support auto updating (#6075)

Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>

frontend/scripts/dev-update-test/serve-update.sh

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+# Starts a local HTTP server on port 8090 serving an update manifest.
+#
+# If a real signed build exists in .update-dist/ (produced by build-dev-update.sh),
+# it is served automatically — enabling the full download + install flow.
+# Otherwise a placeholder manifest is served, which is enough to test the UI only.
+set -euo pipefail
+
+PORT=8090
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DIST_DIR="$SCRIPT_DIR/.update-dist"
+
+if [ -f "$DIST_DIR/latest.json" ]; then
+    # ── real signed build ─────────────────────────────────────────────────────
+    SERVE_DIR="$DIST_DIR"
+    VERSION="$(python3 -c "import json; print(json.load(open('$DIST_DIR/latest.json'))['version'])" 2>/dev/null || grep -o '"version":"[^"]*"' "$DIST_DIR/latest.json" | head -1 | cut -d'"' -f4)"
+    echo "Serving real signed build from .update-dist/"
+    echo "  version : $VERSION"
+    echo "  manifest: http://localhost:$PORT/latest.json"
+    echo "  install : full download + verify flow will work"
+else
+    # ── placeholder (UI testing only) ─────────────────────────────────────────
+    SERVE_DIR="$(mktemp -d)"
+    VERSION="99.0.0"
+
+    OS="$(uname -s)"
+    ARCH="$(uname -m)"
+    case "$OS" in
+      Linux)   TAURI_PLATFORM="linux-x86_64" ;;
+      Darwin)
+        case "$ARCH" in
+          arm64) TAURI_PLATFORM="darwin-aarch64" ;;
+          *)     TAURI_PLATFORM="darwin-x86_64" ;;
+        esac ;;
+      *)       TAURI_PLATFORM="windows-x86_64" ;;
+    esac
+
+    PUB_DATE="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+
+    cat > "$SERVE_DIR/latest.json" << EOF
+{
+  "version": "$VERSION",
+  "notes": "Dev test update v$VERSION — placeholder (UI testing only)",
+  "pub_date": "$PUB_DATE",
+  "platforms": {
+    "$TAURI_PLATFORM": {
+      "signature": "dW50cnVzdGVkIGNvbW1lbnQ6IHBsYWNlaG9sZGVyIHNpZyBmb3IgZGV2IHRlc3Rpbmcgb25seQ==",
+      "url": "http://localhost:$PORT/dummy-update-$VERSION.tar.gz"
+    }
+  }
+}
+EOF
+    echo "No real build found in .update-dist/ — serving placeholder manifest."
+    echo "  version : $VERSION (placeholder)"
+    echo "  manifest: http://localhost:$PORT/latest.json"
+    echo "  install : will fail signature verification (expected for UI testing)"
+    echo ""
+    echo "  To test the full install flow, run first:"
+    echo "  npm run tauri:build-dev-update"
+fi
+
+echo ""
+echo "Press Ctrl+C to stop."
+echo ""
+
+cd "$SERVE_DIR" && python3 -m http.server "$PORT"