Fix CRLF line endings, harden install.sh

- Add .gitattributes enforcing LF line endings
- Renormalize all files from CRLF to LF
- Replace fragile sed-based JSON manipulation with node -e
- Add Node.js 18+ version check (required for built-in fetch)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

install.sh

@@ -8,6 +8,19 @@ INSTALL_DIR="${HOME}/.local/share/claude-statusline"
 CONFIG_DIR="${HOME}/.config/claude-statusline"
 CLAUDE_DIR="${HOME}/.claude"
 
+# --- Check Node.js version (need 18+ for built-in fetch) ---
+NODE_BIN="$(which node 2>/dev/null || echo '')"
+if [ -z "$NODE_BIN" ]; then
+    echo "ERROR: Node.js not found. Install Node.js 18+ first."
+    exit 1
+fi
+NODE_MAJOR=$("$NODE_BIN" -e "process.stdout.write(String(process.versions.node.split('.')[0]))")
+if [ "$NODE_MAJOR" -lt 18 ]; then
+    echo "ERROR: Node.js $("$NODE_BIN" --version) found, but 18+ is required (built-in fetch)."
+    exit 1
+fi
+echo "==> Node.js v${NODE_MAJOR} found at $NODE_BIN"
+
 echo "==> Installing claude-statusline..."
 
 # Copy scripts
@@ -27,28 +40,20 @@ fi
 # Configure Claude Code statusline
 mkdir -p "$CLAUDE_DIR"
 SETTINGS="$CLAUDE_DIR/settings.json"
-NODE_BIN="$(which node 2>/dev/null || echo '/usr/bin/node')"
 
 if [ -f "$SETTINGS" ]; then
-    # Check if statusLine already configured
     if grep -q '"statusLine"' "$SETTINGS" 2>/dev/null; then
         echo "    statusLine already configured in $SETTINGS — skipping"
     else
-        # Insert statusLine before last closing brace
-        TMP=$(mktemp)
-        sed '$ d' "$SETTINGS" > "$TMP"
-        # Add comma if needed
-        if grep -q '[^{]' "$TMP"; then
-            echo ',' >> "$TMP"
-        fi
-        cat >> "$TMP" <<SEOF
-  "statusLine": {
-    "type": "command",
-    "command": "${NODE_BIN} --no-warnings ${INSTALL_DIR}/statusline.js"
-  }
-}
-SEOF
-        mv "$TMP" "$SETTINGS"
+        "$NODE_BIN" -e "
+const fs = require('fs');
+const settings = JSON.parse(fs.readFileSync('$SETTINGS', 'utf8'));
+settings.statusLine = {
+  type: 'command',
+  command: '$NODE_BIN --no-warnings $INSTALL_DIR/statusline.js'
+};
+fs.writeFileSync('$SETTINGS', JSON.stringify(settings, null, 2) + '\n');
+"
         echo "    Added statusLine to $SETTINGS"
     fi
 else