* Detect orphaned state-vN.bin and offer file recovery to a host folder
When STATE_VERSION is bumped, users previously lost their C:\ silently.
The Welcome card now detects an older state file (v4+), explains what
happened, and offers a one-click recovery: spin up a throwaway v86
(no boot), restore the legacy state to populate the hda dirty-block
overlay, walk the FAT32 tree reading overlay-if-dirty-else-base, and
copy any file the guest ever wrote out to ~/Downloads/Recovered C Drive.
Directories are created lazily so empty branches never appear; success
and failure render in the panel (no native dialogs). The geometry
constraint that keeps overlay+new-base valid is documented next to
STATE_VERSION. Also makes the dev-mode CDP port overridable via
WIN95_DEBUG_PORT so worktree instances don't fight over 9222.
* prettier
The stylesheets only used Less for variables and nesting, both of which
are now native CSS features supported by Electron 41's bundled Chromium.
- src/less/ -> src/css/, all .less files renamed to .css
- @win-* variables -> :root custom properties + var()
- // comments -> /* */
- Dropped unused @win-silver
- Removed less devDependency and the dead 'less' npm script
(pointed at a non-existent tools/lessc.js)
