feat(nvim): add transparency for floating UI

Set winblend and pumblend to 20 (80% opaque) for floating windows
and popup menus.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dist/nvim/colors/apex-aeon.lua

@@ -32,6 +32,10 @@ function M.load()
   vim.o.background = "light"
   vim.g.colors_name = "apex-aeon"
 
+  -- Transparency: 80% opaque for floating UI
+  vim.o.winblend = 20
+  vim.o.pumblend = 20
+
   local p = M.palette
   local groups = {
     -- CANVAS & UI -----------------------------------------------------------

dist/nvim/colors/apex-neon.lua

@@ -32,6 +32,10 @@ function M.load()
   vim.o.background = "dark"
   vim.g.colors_name = "apex-neon"
 
+  -- Transparency: 80% opaque for floating UI
+  vim.o.winblend = 20
+  vim.o.pumblend = 20
+
   local p = M.palette
   local groups = {
     -- CANVAS & UI -----------------------------------------------------------

templates/nvim/colors/apex.lua.j2

@@ -32,6 +32,10 @@ function M.load()
   vim.o.background = "{{ type }}"
   vim.g.colors_name = "{{ scheme | lower | replace(' ', '-') }}"
 
+  -- Transparency: 80% opaque for floating UI
+  vim.o.winblend = 20
+  vim.o.pumblend = 20
+
   local p = M.palette
   local groups = {
     -- CANVAS & UI -----------------------------------------------------------