Add Open VSIX build script

Build script that creates Open VSIX variant with different branding:
- Changes displayName to "Claude Code Chat"
- Uses icon.png instead of icon-bubble.png
- Automatically backs up and restores files after build

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.vscodeignore

@@ -13,4 +13,5 @@ backup
 .claude
 claude-code-chat-permissions-mcp/**
 node_modules
-mcp-permissions.js
+mcp-permissions.js
+build

build/open-vsix/build.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+
+# Build script for Open VSIX version
+# This applies Open VSIX-specific changes, builds the package, then reverts
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+VERSION="1.1.0"
+OUTPUT_NAME="vsix-claude-code-chat-${VERSION}.vsix"
+
+echo "Building Open VSIX version ${VERSION}..."
+
+# Backup original files to build folder
+cp package.json "${SCRIPT_DIR}/package.json.backup"
+cp src/extension.ts "${SCRIPT_DIR}/extension.ts.backup"
+
+# Backup original icon.png if it exists
+if [ -f "icon.png" ]; then
+    mv icon.png "${SCRIPT_DIR}/icon.png.backup"
+fi
+
+# Copy Open VSIX icon
+cp "${SCRIPT_DIR}/icon.png" icon.png
+echo "Copied Open VSIX icon"
+
+# Temporarily remove icon-bubble.png (not needed for Open VSIX)
+if [ -f "icon-bubble.png" ]; then
+    mv icon-bubble.png "${SCRIPT_DIR}/icon-bubble.png.backup"
+fi
+
+# Apply Open VSIX changes to package.json
+sed -i.bak 's/"displayName": "Chat for Claude Code"/"displayName": "Claude Code Chat"/' package.json
+sed -i.bak 's/"icon": "icon-bubble.png"/"icon": "icon.png"/g' package.json
+rm -f package.json.bak
+
+# Apply Open VSIX changes to extension.ts
+sed -i.bak "s/icon-bubble.png/icon.png/g" src/extension.ts
+rm -f src/extension.ts.bak
+
+echo "Applied Open VSIX changes to package.json and extension.ts"
+
+# Compile TypeScript
+echo "Compiling TypeScript..."
+npm run compile
+
+# Build the VSIX
+echo "Building VSIX package..."
+vsce package --out "${OUTPUT_NAME}"
+
+# Restore original files from build folder
+mv "${SCRIPT_DIR}/package.json.backup" package.json
+mv "${SCRIPT_DIR}/extension.ts.backup" src/extension.ts
+
+# Restore original icon
+rm -f icon.png
+if [ -f "${SCRIPT_DIR}/icon.png.backup" ]; then
+    mv "${SCRIPT_DIR}/icon.png.backup" icon.png
+fi
+
+# Restore icon-bubble.png
+if [ -f "${SCRIPT_DIR}/icon-bubble.png.backup" ]; then
+    mv "${SCRIPT_DIR}/icon-bubble.png.backup" icon-bubble.png
+fi
+
+# Recompile with original extension.ts
+echo "Recompiling with original files..."
+npm run compile
+
+echo "Restored original files"
+echo "Built: ${OUTPUT_NAME}"