refactor(plugins): change external terminal provider to ghostty

lua/plugins/astrocore.lua

@@ -26,17 +26,14 @@ return {
         terminal = {
           split_side = "right", -- "left" or "right"
           split_width_percentage = 0.30,
-          provider = "auto", -- "auto", "snacks", "native", "external", "none", or custom provider table
+          provider = "external", -- "auto", "snacks", "native", "external", "none", or custom provider table
           auto_close = true,
           snacks_win_opts = {}, -- Opts to pass to `Snacks.terminal.open()` - see Floating Window section below
 
           -- Provider-specific options
           provider_opts = {
             -- Command for external terminal provider. Can be:
-            -- 1. String with %s placeholder: "alacritty -e %s" (backward compatible)
-            -- 2. String with two %s placeholders: "alacritty --working-directory %s -e %s" (cwd, command)
-            -- 3. Function returning command: function(cmd, env) return "alacritty -e " .. cmd end
-            external_terminal_cmd = nil,
+            external_terminal_cmd = "ghostty --working-directory %s -e %s",
           },
         },
       },