Add two named themes alongside the existing system/light/dark:

- Studio: a cool, dark, scientific base (#0c0f14 ground) with a calm
  teal accent (#37c0a6)
- Atlas: Studio's light sibling for bright rooms, same teal accent

Both build on qdarkstyle's Dark/Light base, then a single-pass palette
remap substitutes every qdarkstyle hex for its Studio/Atlas counterpart.
qdarkstyle's palette constants are read at run time, so the remap tracks
the installed version; light/dark are left untouched. The on-accent ink
turns dark on the brighter teal so selected rows, highlighted menu items,
and the active-tool glyph stay legible (white on #37c0a6 is ~2.3:1).

Both theme pickers (All Options > View and the Theme menu) offer the new
options; the choice persists via the existing QSettings "theme" key, and
normalize_mode stays backward-compatible (legacy default/qdark migrate).

Studio's palette is lifted from the UI-direction mockup; Atlas's light
shell is derived to mirror it, since the mockup names Atlas but gives no
explicit palette. Hues are provisional, intended for interactive tuning.

Adds headless tests covering theme/family resolution, per-theme accent
and icon colors, stylesheet distinctness, remap completeness (no
qdarkstyle hue survives), the light/dark-unchanged contract, and
persistence round-trips.

…t/ui-theme-studio-atlas

# Conflicts:
#	PyReconstruct/modules/gui/dialog/all_options.py