Integrate Copilot with Blink.cmp

- Switch from copilot.vim to zbirenbaum/copilot.lua
- Add blink-cmp-copilot for completion integration
- Configure Blink to show Copilot in completion menu
- Fix plugin import issues

Testing in progress - can be reverted if needed

lua/custom/plugins/copilot.lua

@@ -1,14 +1,35 @@
 return {
+  -- Use copilot.lua for API access (no UI)
   {
-    'github/copilot.vim',
-    event = 'VimEnter',
+    "zbirenbaum/copilot.lua",
+    cmd = "Copilot",
+    event = "InsertEnter",
     config = function()
-      -- Accept suggestion with Ctrl-y
-      vim.keymap.set('i', '<C-y>', 'copilot#Accept("\\<CR>")', {
-        expr = true,
-        replace_keycodes = false
+      require("copilot").setup({
+        suggestion = { enabled = false }, -- Disable inline ghost text
+        panel = { enabled = false },      -- Disable suggestion panel
+        filetypes = {
+          yaml = false,
+          markdown = false,
+          help = false,
+          gitcommit = false,
+          gitrebase = false,
+          hgcommit = false,
+          svn = false,
+          cvs = false,
+          ["."] = false,
+        },
+        copilot_node_command = 'node', -- Node.js version must be > 18.x
+        server_opts_overrides = {},
       })
-      vim.g.copilot_no_tab_map = true
     end,
   },
+  
+  -- Bridge between copilot.lua and blink.cmp
+  {
+    "giuxtaposition/blink-cmp-copilot",
+    dependencies = {
+      "zbirenbaum/copilot.lua",
+    },
+  },
 }