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-light.toml

@@ -0,0 +1,34 @@
+[meta]
+name = "Whimsy Light"
+
+[colour]
+background     = "#f3f2f8"
+surface        = "#ffffff"
+surface_raised = "#e6e4f0"
+accent         = "#0b6bcb"
+on_accent      = "#ffffff"
+text_primary   = "#1a1a2e"
+text_secondary = "#55556e"
+destructive    = "#c62828"
+on_destructive = "#ffffff"
+focus          = "#1a1a2e"
+
+[wallpaper]
+orbs = ["#c9b8ff", "#a8e6ff", "#ffc6e8"]
+
+[shape]
+corner_radius = 16
+
+[spacing]
+base = 4
+
+[motion]
+duration_fast    = 150
+duration_normal  = 280
+spring_stiffness = 300
+spring_damping   = 30
+
+[glass]
+blur_radius   = 12
+panel_opacity = 64
+highlight     = 40