ux(configurator): restructure mios.html into 3 zones for non-technical users

Reorganizes the SSOT TOML editor into a friendlier top-down layout: Zone 1 (Personal, expanded by default) -- identity, locale, look and feel, color palette pickers; Zone 2 (Apps and Flatpaks, expanded by default) -- desktop session, full Flatpak catalog, Windows Start Menu shortcuts; Zone 3 (Advanced/Admin, collapsed by default) wraps every technical sub-section in one outer <details>: packages, deployment targets, Quadlet services, Windows bootstrap, ports, sidecars, paths/build, terminal/font/prompt, AI endpoints, preflight, raw TOML preview. All 135 unique TOML data-keys preserved verbatim; the entire script block (parseToml/emitToml/refreshFromData/gatherFromForm/renderColors/renderFlatpaks/applyColorsToRoot, the FSA pick/save handlers, the Open fallback, Defaults, Save) is untouched. Beautified with card-based sub-sections, soft gradients, focus rings, hover states, and a two-column desktop / single-column narrow-viewport responsive grid.

Author: Kabuki94