Match setup screens to the approved compact mockup

[sridharkalaibala]

Setup still inherited the old heading underlines, stretched navigation buttons and expanded offline form after the approved compact mockup was implemented. Use the approved text header, consistent footer actions and three-field offline form, with optional shop details collapsed. Start empty without sample data. Use the selected application palette for dark-mode help text and recovery codes.

Validation: 13 setup/recovery tests and 3 Windows uninstall-helper tests passed (including all eight keep combinations). Rendered 28 screen layouts across light/dark themes and 800/420-pixel widths with no horizontal overflow or clipped card top. Reviewed the rendered screens against the approved mockup. Both Windows installer packages rebuilt and installed through their native Windows installers. Both installed apps passed offline creation, recovery acknowledgement, existing-shop continuation, fresh reset with hardware retention, and graceful shutdown using isolated test shops. Installed ASAR hashes match the built packages. Native uninstall UI remains unverified because the Windows automation tool blocked launching the uninstaller; helper behavior passed. Successful live cloud enrollment and physical hardware operation remain unverified.

No business-data schema, sync transport or device-profile changes. Existing local setup and recovery semantics remain unchanged; hardware preferences remain local-only.

[github-actions]

Merged to develop. Anyone can test this - you do not need write access.

Try it at https://develop.posnic.io, or run it yourself:

git fetch origin develop && git checkout develop
npm install && npm --prefix api install
npm run dev   # then http://localhost:3000

When you have tested it, say what you did and what happened, and set
QA passed or QA failed. If you cannot set labels, just comment -
a maintainer will.

Reporting that something is broken is as useful as fixing it. It is
better found here than by a shopkeeper.