refactor: add actions to renderer, remove formatter state

Also hook up context menu autocmds so they show up now. Haven't tested
if they acutally work

Author: cameronr

lua/opencode/api.lua

@@ -577,7 +577,7 @@ function M.undo()
   -- ui.render_output(true)
   state.api_client
     :revert_message(state.active_session.id, {
-      messageID = last_user_message.id,
+      messageID = last_user_message.info.id,
     })
     :and_then(function(response)
       state.active_session.revert = response.revert

lua/opencode/state.lua

@@ -25,7 +25,7 @@ local config = require('opencode.config')
 ---@field current_model_info table|nil
 ---@field messages OpencodeMessage[]|nil
 ---@field current_message OpencodeMessage|nil
----@field last_user_message MessageInfo|nil
+---@field last_user_message OpencodeMessage|nil
 ---@field current_permission OpencodePermission|nil
 ---@field cost number
 ---@field tokens_count number

lua/opencode/ui/contextual_actions.lua

@@ -16,17 +16,17 @@ local function clear_keymaps(buf)
   current_keymaps = {}
 end
 
-function M.setup_contextual_actions()
+function M.setup_contextual_actions(windows)
   local ns_id = vim.api.nvim_create_namespace('opencode_contextual_actions')
   local augroup = vim.api.nvim_create_augroup('OpenCodeContextualActions', { clear = true })
 
   vim.api.nvim_create_autocmd('CursorHold', {
     group = augroup,
-    buffer = state.windows.output_buf,
+    buffer = windows.output_buf,
     callback = function()
       vim.schedule(function()
         local line_num = vim.api.nvim_win_get_cursor(0)[1]
-        local actions = require('opencode.ui.formatter').output:get_actions_for_line(line_num)
+        local actions = require('opencode.ui.renderer').get_actions_for_line(line_num)
         last_line_num = line_num
 
         vim.api.nvim_buf_clear_namespace(state.windows.output_buf, ns_id, 0, -1)
@@ -42,7 +42,7 @@ function M.setup_contextual_actions()
 
   vim.api.nvim_create_autocmd('CursorMoved', {
     group = augroup,
-    buffer = state.windows.output_buf,
+    buffer = windows.output_buf,
     callback = function()
       vim.schedule(function()
         if not output_window.mounted() then
@@ -59,7 +59,7 @@ function M.setup_contextual_actions()
 
   vim.api.nvim_create_autocmd({ 'BufLeave', 'BufDelete', 'BufHidden' }, {
     group = augroup,
-    buffer = state.windows.output_buf,
+    buffer = windows.output_buf,
     callback = function()
       vim.api.nvim_buf_clear_namespace(state.windows.output_buf, ns_id, 0, -1)
       clear_keymaps(state.windows.output_buf)