fix(studio): inject version from package.json and include in all telemetry events (#1151)

The Vite build relied on process.env.npm_package_version which is only
set when invoked through npm/bun run scripts. CI builds running vite
build directly got "dev" as the version. Read package.json directly so
the version is always correct regardless of invocation method.

Also add studio_version to the BrowserSystemMeta interface so the new
telemetry system (studio_session_start, studio_render_start, etc.)
includes the deployed version in every event.