[nvim] Add opencode plugin

.config/nvim/lua/plugins/opencode.lua

@@ -0,0 +1,19 @@
+return {
+   'NickvanDyke/opencode.nvim',
+  dependencies = { 'folke/snacks.nvim', },
+  ---@type opencode.Config
+  opts = {
+    -- Your configuration, if any
+  },
+  -- stylua: ignore
+  keys = {
+    { '<leader>ot', function() require('opencode').toggle() end, desc = 'Toggle embedded opencode', },
+    { '<leader>oa', function() require('opencode').ask() end, desc = 'Ask opencode', mode = 'n', },
+    { '<leader>oa', function() require('opencode').ask('@selection: ') end, desc = 'Ask opencode about selection', mode = 'v', },
+    { '<leader>op', function() require('opencode').select_prompt() end, desc = 'Select prompt', mode = { 'n', 'v', }, },
+    { '<leader>on', function() require('opencode').command('session_new') end, desc = 'New session', },
+    { '<leader>oy', function() require('opencode').command('messages_copy') end, desc = 'Copy last message', },
+    { '<S-C-u>',    function() require('opencode').command('messages_half_page_up') end, desc = 'Scroll messages up', },
+    { '<S-C-d>',    function() require('opencode').command('messages_half_page_down') end, desc = 'Scroll messages down', },
+  },
+}