feat(ui): modernize nvim with fzf-lua, snacks dashboard, and p10k-style statusline

- Replace Snacks picker with fzf-lua for LSP navigation (gd, gr, gi, gt)
- Add fzf-lua plugin with LSP-optimized settings
- Fix Mason inconsistencies (add eslint, gopls to ensure_installed)
- Replace alpha-nvim with Snacks dashboard (shared config)
- Create dashboard_config.lua for DRY dashboard settings
- Modernize lualine with p10k-rainbow style and solid backgrounds
- Enhance bufferline with LSP diagnostics and modern styling
- Update noice with centered cmdline/search and modern icons
- Add global rounded borders for floating windows
- Improve indent-blankline with scope highlighting
- Add return-to-dashboard on last buffer close
- Create performance_monitor module

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

lua/cargdev/plugins/lsp/mason.lua

@@ -27,17 +27,19 @@ return {
     mason_lspconfig.setup({
       -- list of servers for mason to install
       ensure_installed = {
-        "ts_ls",
-        "html",
         "cssls",
-        "tailwindcss",
-        "svelte",
-        "lua_ls",
-        "graphql",
         "emmet_ls",
+        "eslint",
+        "gopls",
+        "graphql",
+        "html",
+        "jdtls",
+        "lua_ls",
         "prismals",
         "pyright",
-        "jdtls",
+        "svelte",
+        "tailwindcss",
+        "ts_ls",
       },
     })