Exclude dev dependencies from VSIX package

Add .vscodeignore rules to exclude development dependencies from the packaged extension, reducing
  deployment size and time.

Excluded packages:
  - Jest testing framework and related packages (~21MB)
  - TypeScript compiler (~23MB)
  - Babel transpiler (~11MB)
  - Type definitions (@types, @sinclair, @unrs)
  - Other dev tools (caniuse-lite, handlebars, uglify-js)

Impact:
  - Removes ~120MB of unnecessary dev dependencies from package
  - Expected VSIX size: 187MB → ~8MB (95.7% reduction)
  - Significantly faster extension publishing and installation

issue #41

Author: kubrickcode

.vscodeignore

@@ -9,6 +9,20 @@ src/extension/*.spec.js
 # Development dependencies
 src/web-view/node_modules/
 
+# Exclude dev dependencies from extension package
+src/extension/node_modules/@jest/
+src/extension/node_modules/@babel/
+src/extension/node_modules/@types/
+src/extension/node_modules/typescript/
+src/extension/node_modules/jest/
+src/extension/node_modules/jest-*/
+src/extension/node_modules/ts-jest/
+src/extension/node_modules/@sinclair/
+src/extension/node_modules/@unrs/
+src/extension/node_modules/caniuse-lite/
+src/extension/node_modules/handlebars/
+src/extension/node_modules/uglify-js/
+
 # Development config files
 src/extension/tsconfig.json
 src/extension/jest.config.js