chore: clean up dotfiles and add gitignore whitelist

Switch to whitelist-based .gitignore to only track essential configs:
nvim, yazi, kitty, zsh, ideavim, karabiner, tmux, scripts, starship.
Remove history, compiled files, and plugin dirs from tracking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nvim/lua/plugins/lsp.lua

@@ -104,7 +104,7 @@ return {
         end,
       },
       {
-        "fmuaddel/blink-copilot",
+        "giuxtaposition/blink-cmp-copilot",
         dependencies = { "zbirenbaum/copilot.lua" },
       },
     },
@@ -126,7 +126,7 @@ return {
           },
           copilot = {
             name = "copilot",
-            module = "blink-copilot",
+            module = "blink-cmp-copilot",
             score_offset = 50,
             async = true,
           },