[Aghayenoor]

The Settings panel reads the frontend package version, which remains 1.3.0 independently of the server release. Fixes #368.

During the packaged web build, read the version from XVNCVERSION in xvnc.c and set it in the container's copy of the frontend package.json before Vite builds the Settings asset. Rebuild cached web output when that source changes. The frontend submodule and its tracked package metadata are unchanged.

Validation:

• Container regression test passes for 1.5.2 and 1.6.0~beta and rejects a missing version definition. Against the original build script it fails with 1.3.0 != 1.5.2.
• Built builder/dockerfile.www.build with OUTPUT_OWNER_UID=1000 and ran its web-build entrypoint with networking disabled. The production build passed; the shipped package.json and generated control-panel asset contain 1.5.1, matching the current server source.
• Shell syntax and diff whitespace checks passed in containers.

A full Xvnc build, desktop/browser session, distro package installation, and private functional test suite were not run. The regression test stubs npm to test version propagation; the separate production build exercises the real Vite build.