feat(themes/crbn): add NULL dark theme variant and refine UI colors

- feat: introduce new `crbn-null` dark theme with cool gray undertones
- refactor: rename `carbon-super` to `crbn-supr` for consistency
- style(ui): update cursor line highlighting to use `bg.active`
- feat(plugins): add highlight groups for `snacks.nvim`
- docs: update theme key registry with new `crbn-null` entry
- style(crbn/supr): promote theme status from `beta` to `release`

colors/black-atom-crbn-null.lua

@@ -0,0 +1,3 @@
+local theme = require("black-atom.themes.crbn.black-atom-crbn-null")
+
+require("black-atom").load(theme)

lua/black-atom/highlights/plugins/snacks_nvim.lua

@@ -0,0 +1,14 @@
+---@doc https://github.com/username/plugin-name
+---@type BlackAtom.HighlightsSpec
+return {
+    enabled = true,
+    map = function(colors, config)
+        local ui = colors.ui
+
+        ---@type BlackAtom.Highlights
+        return {
+            SnacksPickerCursorLine = { bg = ui.bg.active },
+            SnacksPickerListCursorLine = { link = "SnacksPickerCursorLine" },
+        }
+    end,
+}

lua/black-atom/highlights/ui.lua

@@ -29,8 +29,8 @@ return {
             TermCursor = { link = "Cursor" },
             TermCursorNC = { link = "Cursor" },
 
-            CursorLine = { bg = ui.bg.primary.dark },
-            CursorColumn = { bg = ui.bg.primary.dark },
+            CursorLine = { bg = ui.bg.active },
+            CursorColumn = { bg = ui.bg.active },
 
             -- Search
             Search = { bg = ui.bg.match.passive },
@@ -44,7 +44,7 @@ return {
 
             -- Line Numbering
             LineNr = { fg = ui.fg.neutral },
-            CursorLineNr = { fg = ui.fg.active, bg = ui.bg.primary.dark },
+            CursorLineNr = { fg = ui.fg.active, bg = ui.bg.active },
 
             -- Diff
             DiffAdd = { fg = ui.fg.invert, bg = ui.bg.diff.add },

lua/black-atom/themes/crbn/black-atom-crbn-null.lua

@@ -0,0 +1,76 @@
+local M = {}
+
+---@type BlackAtom.Theme.Meta
+M.meta = {
+    key = "black-atom-crbn-null",
+    label = "Black Atom - CRBN [NULL]",
+    collection = {
+        key = "crbn",
+        label = "CRBN",
+    },
+    appearance = "dark",
+    icon = " 󰛸 ",
+    status = "release",
+}
+
+---@type BlackAtom.Theme.Primaries
+M.primaries = {
+    -- Lows
+    "#141a20",
+    "#1d2730",
+    "#2f4152",
+
+    -- Mids
+    "#566575",
+    "#6c8093",
+    "#819cb1",
+
+    -- Highs
+    "#d3d9df",
+    "#e0e6ec",
+    "#ebf2f8",
+}
+
+---@type BlackAtom.Theme.Palette
+M.palette = {
+    black = M.primaries[2],
+    gray = M.primaries[4],
+
+    dark_red = "#f33e25",
+    red = "#ff624d",
+
+    dark_green = "#6ad147",
+    green = "#8bdb70",
+
+    dark_yellow = "#e9693d",
+    yellow = "#ff8357",
+
+    dark_blue = "#4481ef",
+    blue = "#679cff",
+
+    dark_magenta = M.primaries[5],
+    magenta = M.primaries[6],
+
+    dark_cyan = M.primaries[3],
+    cyan = M.primaries[2],
+
+    dark_gray = M.primaries[7],
+    white = M.primaries[9],
+}
+
+---@type BlackAtom.Theme.Syntax
+M.syntax = require("black-atom.themes.crbn.syntax_dark")(M.primaries, M.palette)
+
+---@typ BlackAtom.Theme.UI
+M.ui = require("black-atom.themes.crbn.ui_dark")(M.primaries, M.palette)
+
+---@type BlackAtom.Theme.Colors
+M.colors = {
+    none = "NONE",
+    primaries = M.primaries,
+    palette = M.palette,
+    ui = M.ui,
+    syntax = M.syntax,
+}
+
+return M

lua/black-atom/themes/crbn/black-atom-crbn-supr.lua

@@ -10,7 +10,7 @@ M.meta = {
     },
     appearance = "light",
     icon = " 󰛸 ",
-    status = "beta",
+    status = "release",
 }
 
 ---@type BlackAtom.Theme.Primaries

lua/black-atom/themes/crbn/syntax_dark.lua

@@ -0,0 +1,103 @@
+---@param primaries BlackAtom.Theme.Primaries
+---@param palette BlackAtom.Theme.Palette
+---@return BlackAtom.Theme.Syntax
+return function(primaries, palette)
+    return {
+        variable = {
+            default = primaries[6],
+            builtin = primaries[6],
+            member = primaries[5],
+            parameter = palette.dark_yellow,
+        },
+        property = {
+            default = primaries[7],
+        },
+        string = {
+            default = primaries[5],
+            doc = primaries[4],
+            regexp = primaries[9],
+            escape = primaries[9],
+        },
+        constant = {
+            default = primaries[6],
+            builtin = primaries[7],
+        },
+        module = {
+            default = palette.yellow,
+        },
+        boolean = {
+            default = palette.gray,
+        },
+        number = {
+            default = primaries[6],
+        },
+        type = {
+            default = primaries[9],
+            builtin = primaries[7],
+        },
+        attribute = {
+            default = palette.dark_yellow,
+            builtin = palette.dark_yellow,
+        },
+        func = {
+            default = palette.yellow,
+            builtin = palette.dark_yellow,
+            method = palette.yellow,
+        },
+        constructor = {
+            default = palette.yellow,
+        },
+        keyword = {
+            default = primaries[8],
+            import = primaries[6],
+            export = primaries[6],
+        },
+        operator = {
+            default = palette.white,
+        },
+        punctuation = {
+            default = palette.white,
+            delimiter = palette.white,
+            bracket = palette.white,
+            special = palette.white,
+        },
+        comment = {
+            default = palette.gray,
+            doc = primaries[6],
+            todo = palette.green,
+            error = palette.red,
+            warn = palette.yellow,
+            info = palette.blue,
+            hint = palette.dark_yellow,
+        },
+        markup = {
+            heading = {
+                h1 = palette.yellow,
+                h2 = palette.yellow,
+                h3 = palette.yellow,
+                h4 = palette.gray,
+                h5 = palette.gray,
+                h6 = palette.gray,
+            },
+            list = {
+                default = palette.gray,
+                checked = palette.green,
+                unchecked = palette.gray,
+            },
+            quote = palette.green,
+            math = palette.dark_green,
+            link = palette.green,
+            code = {
+                fg = primaries[7],
+                bg = primaries[4],
+            },
+        },
+        tag = {
+            default = palette.yellow,
+            builtin = palette.dark_yellow,
+            custom = palette.yellow,
+            attribute = primaries[4],
+            delimiter = primaries[5],
+        },
+    }
+end

lua/black-atom/themes/crbn/ui_dark.lua

@@ -0,0 +1,50 @@
+---@param primaries BlackAtom.Theme.Primaries
+---@param palette BlackAtom.Theme.Palette
+---@return BlackAtom.Theme.UI
+return function(primaries, palette)
+    ---@type BlackAtom.Theme.UI
+    return {
+        bg = {
+            primary = {
+                main = primaries[1], -- primary
+                dark = primaries[2], -- secondary
+                light = primaries[3], -- tertiary
+            },
+            active = primaries[3],
+            match = {
+                active = palette.magenta,
+                passive = primaries[2],
+            },
+            diff = {
+                add = palette.green,
+                delete = palette.red,
+                change = palette.blue,
+                text = palette.dark_blue,
+            },
+        },
+        fg = {
+            primary = {
+                main = primaries[9],
+                dark = primaries[8],
+                light = primaries[7],
+            },
+            active = palette.yellow,
+            invert = primaries[2],
+            neutral = primaries[6],
+            diff = {
+                add = palette.green,
+                delete = palette.red,
+                change = palette.blue,
+                text = palette.dark_blue,
+            },
+        },
+        feedback = {
+            error = palette.red,
+            warn = palette.yellow,
+            info = palette.blue,
+            hint = palette.dark_yellow,
+            todo = palette.yellow,
+            success = palette.green,
+        },
+    }
+end

lua/black-atom/themes/crbn/ui_light.lua

@@ -6,11 +6,11 @@ return function(primaries, palette)
     return {
         bg = {
             primary = {
-                dark = primaries[8],
-                main = primaries[9],
-                light = primaries[7],
+                dark = primaries[8], -- secondary
+                main = primaries[9], -- primary
+                light = primaries[7], -- tertiary
             },
-            active = primaries[6],
+            active = primaries[7],
             match = {
                 active = palette.magenta,
                 passive = primaries[8],

lua/black-atom/types.lua

@@ -9,6 +9,7 @@
 ---| "black-atom-jpn-koyo-hiru"
 ---| "black-atom-jpn-tsuki-yoru"
 ---| "black-atom-mono-one-dark"
+---| "black-atom-crbn-null"
 ---| "black-atom-crbn-supr"
 ---| "terra-spring-day"
 ---| "terra-spring-night"