feat(theme): themes as files (theme crate: toml subset + ints, contrast check, wire); whimsy dark + light; display reads themes/, serves THEME/THEME_NAME, init SET_THEME -> THEME_CHANGED to all windows, bar themed; k-ui follows; settings appearance; init keeps choice in sealed users/<id>/settings/, reapplies at sign-in + display restart

disk/themes/whimsy-dark.toml

@@ -0,0 +1,37 @@
+# The default theme. Colours are #rrggbb; every pairing text is drawn in
+# is checked for contrast when the theme is loaded.
+
+[meta]
+name = "Whimsy Dark"
+
+[colour]
+background     = "#0f0e17"
+surface        = "#1a1a2e"
+surface_raised = "#2a2a44"
+accent         = "#4fc3f7"
+on_accent      = "#0f0e17"
+text_primary   = "#e0e0e0"
+text_secondary = "#9e9eb8"
+destructive    = "#ef5350"
+on_destructive = "#1a0a0a"
+focus          = "#ffffff"
+
+[wallpaper]
+orbs = ["#3a1c71", "#0f4c5c", "#5b1a4a"]
+
+[shape]
+corner_radius = 16
+
+[spacing]
+base = 4
+
+[motion]
+duration_fast    = 150   # ms; 0 turns motion off
+duration_normal  = 280
+spring_stiffness = 300
+spring_damping   = 30
+
+[glass]
+blur_radius   = 12
+panel_opacity = 72       # percent
+highlight     = 18       # percent