Nightshift

Added

• Initial release: a dark theme for the Craft 5 control panel.
• One-click sun/moon toggle in the CP header, pinned next to the account menu.
• Follows the OS setting (prefers-color-scheme) by default and reacts to it live; clicking the toggle sets an explicit per-browser override, persisted in localStorage['cp-theme'] and applied before first paint (no flash of the wrong theme on load).
• Token-first theming: flips Craft's HSL neutral ramp (--gray-NNN-hsl) once, so surfaces, hairlines and text recolour coherently — covering the global sidebar, header, panes, cards, inputs, checkboxes, dropdown menus, date/time pickers, HUDs, modals, slideouts (incl. the field-layout designer), data tables, and the Plugin Store (Vue/Tailwind).
• Elevation expressed with surface + hairline instead of muddy dark-on-dark drop shadows; pop-overs keep only a whisper of shadow.
• Brand/status colours (red/teal/amber/sky) and focus rings left untouched.
• Asset bundle depends on CpAsset so overrides load after Craft's core CP CSS.