fix(palette): rework dayfox to ensure contrast

The old dayfox had little contrast for the colors compared to the
background. Dayfox has been completely reworked to address this issue.

Some notes about design:

- Background blended with yellow to make it not as white on the eyes
- Foreground is blended with magenta to contrast the yellow in the bg

lua/nightfox/palette/dayfox.lua

@@ -8,33 +8,32 @@ local meta = {
 
 -- stylua: ignore
 local palette = {
-  black   = Shade.new("#1d344f", "#24476f", "#1c2f44", true),
-  red     = Shade.new("#b95d76", "#c76882", "#ac5169", true),
-  green   = Shade.new("#618774", "#629f81", "#597668", true),
-  yellow  = Shade.new("#ba793e", "#ca884a", "#a36f3e", true),
-  blue    = Shade.new("#4d688e", "#4e75aa", "#485e7d", true),
-  magenta = Shade.new("#8e6f98", "#9f75ac", "#806589", true),
-  cyan    = Shade.new("#6ca7bd", "#74b2c9", "#5a99b0", true),
-  white   = Shade.new("#cdd1d5", "#cfd6dd", "#b6bcc2", true),
-  orange  = Shade.new("#e3786c", "#e8857a", "#d76558", true),
-  pink    = Shade.new("#d685af", "#de8db7", "#c9709e", true),
-
-  comment = "#7f848e",
-
-  bg0     = "#dbdbdb", -- Dark bg (status line and float)
-  bg1     = "#eaeaea", -- Default bg
-  bg2     = "#dbcece", -- Lighter bg (colorcolm folds)
-  bg3     = "#ced6db", -- Lighter bg (cursor line)
-  bg4     = "#bebebe", -- Conceal, border fg
-
-  fg0     = "#182a40", -- Lighter fg
-  fg1     = "#1d344f", -- Default fg
-  fg2     = "#233f5e", -- Darker fg (status line)
-  fg3     = "#2e537d", -- Darker fg (line numbers, fold colums)
-  -- fg3  = "#848f9c", -- Darker fg (line numbers, fold colums)
-
-  sel0    = "#ced5de", -- Popup bg, visual selection bg
-  sel1    = "#b6c4d9", -- Popup sel bg, search bg
+  black   = Shade.new("#282828", 0.15, -0.15, true),
+  red     = Shade.new("#a5222f", 0.15, -0.15, true),
+  green   = Shade.new("#396847", 0.15, -0.15, true),
+  yellow  = Shade.new("#AC5402", 0.15, -0.15, true),
+  blue    = Shade.new("#2848a9", 0.15, -0.15, true),
+  magenta = Shade.new("#6e33ce", 0.15, -0.15, true),
+  cyan    = Shade.new("#287980", 0.15, -0.15, true),
+  white   = Shade.new("#fafafa", 0.15, -0.15, true),
+  orange  = Shade.new("#d75f00", 0.15, -0.15, true),
+  pink    = Shade.new("#a440b5", 0.15, -0.15, true),
+
+  comment = "#837a72",
+
+  bg0     = "#e6dcd4", -- Dark bg (status line and float)
+  bg1     = "#f6f2ee", -- Default bg
+  bg2     = "#dbd1dd", -- Lighter bg (colorcolm folds)
+  bg3     = "#d7c8bb", -- Lighter bg (cursor line)
+  bg4     = "#aab0ad", -- Conceal, border fg
+
+  fg0     = "#302b5d", -- Lighter fg
+  fg1     = "#3d2b5a", -- Default fg
+  fg2     = "#643f61", -- Darker fg (status line)
+  fg3     = "#824d5b", -- Darker fg (line numbers, fold colums)
+
+  sel0    = "#e7d2be", -- Popup bg, visual selection bg
+  sel1    = "#a4c1c2", -- Popup sel bg, search bg
 }
 
 local function generate_spec(pal)