feat(ui): Add more LSP improvements, install fancy UI plugins

lua/completion.lua

@@ -6,7 +6,17 @@ cmp.build():pwait()
 ---@type blink.cmp.Config
 local cmp_options = {
 	keymap = { preset = "default" },
-	completion = { menu = { auto_show = true }, documentation = { auto_show = true } },
+	completion = {
+		menu = { auto_show = true },
+		documentation = { auto_show = true },
+		ghost_text = { enabled = true },
+		list = {
+			selection = {
+				auto_insert = false,
+				preselect = true,
+			},
+		},
+	},
 	sources = { default = { "lsp", "path", "snippets", "buffer" } },
 	fuzzy = { implementation = "rust" },
 }