refactor: streamline debug info into info mapping

Move debug info functionality into info mapping and remove separate
debug UI window. This simplifies the codebase while keeping all debugging
functionality available through a unified interface. The debug info now
includes:

- Log file location
- History file location
- Temp files directory
- Model and agent info
- System prompt details

BREAKING CHANGE: Removes CopilotChatDebugInfo command. Use `gi` in chat
instead.

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

Author: deathbeam

README.md

@@ -116,7 +116,6 @@ Commands are used to control the chat interface:
 | `:CopilotChatReset`        | Reset chat window             |
 | `:CopilotChatSave <name>?` | Save chat history             |
 | `:CopilotChatLoad <name>?` | Load chat history             |
-| `:CopilotChatDebugInfo`    | Show debug info               |
 | `:CopilotChatModels`       | View/select available models  |
 | `:CopilotChatAgents`       | View/select available agents  |
 | `:CopilotChat<PromptName>` | Use specific prompt template  |
@@ -500,6 +499,8 @@ Below are all available configuration options with their default values:
   allow_insecure = false, -- Allow insecure server connections
 
   chat_autocomplete = true, -- Enable chat autocompletion (when disabled, requires manual `mappings.complete` trigger)
+
+  log_path = vim.fn.stdpath('state') .. '/CopilotChat.log', -- Default path to log file
   history_path = vim.fn.stdpath('data') .. '/copilotchat_history', -- Default path to stored history
 
   question_header = '# User ', -- Header to use for user questions

lua/CopilotChat/config.lua

@@ -40,6 +40,7 @@ local select = require('CopilotChat.select')
 ---@field proxy string?
 ---@field allow_insecure boolean?
 ---@field chat_autocomplete boolean?
+---@field log_path string?
 ---@field history_path string?
 ---@field question_header string?
 ---@field answer_header string?
@@ -101,6 +102,8 @@ return {
   allow_insecure = false, -- Allow insecure server connections
 
   chat_autocomplete = true, -- Enable chat autocompletion (when disabled, requires manual `mappings.complete` trigger)
+
+  log_path = vim.fn.stdpath('state') .. '/CopilotChat.log', -- Default path to log file
   history_path = vim.fn.stdpath('data') .. '/copilotchat_history', -- Default path to stored history
 
   question_header = '## User ', -- Header to use for user questions

lua/CopilotChat/config/mappings.lua

@@ -352,22 +352,22 @@ return {
       local system_prompt = config.system_prompt
 
       async.run(function()
-        local selected_agent = copilot.resolve_agent(prompt, config)
-        local selected_model = copilot.resolve_model(prompt, config)
+        local _, selected_agent = pcall(copilot.resolve_agent, prompt, config)
+        local _, selected_model = pcall(copilot.resolve_model, prompt, config)
+
+        async.util.scheduler()
+        table.insert(lines, '**Logs**: `' .. chat.config.log_path .. '`')
+        table.insert(lines, '**History**: `' .. chat.config.history_path .. '`')
+        table.insert(lines, '**Temp Files**: `' .. vim.fn.fnamemodify(os.tmpname(), ':h') .. '`')
+        table.insert(lines, '')
 
         if selected_model then
-          table.insert(lines, '**Model**')
-          table.insert(lines, '```')
-          table.insert(lines, selected_model)
-          table.insert(lines, '```')
+          table.insert(lines, '**Model**: `' .. selected_model .. '`')
           table.insert(lines, '')
         end
 
         if selected_agent then
-          table.insert(lines, '**Agent**')
-          table.insert(lines, '```')
-          table.insert(lines, selected_agent)
-          table.insert(lines, '```')
+          table.insert(lines, '**Agent**: `' .. selected_agent .. '`')
           table.insert(lines, '')
         end
 
@@ -381,7 +381,6 @@ return {
           table.insert(lines, '')
         end
 
-        async.util.scheduler()
         overlay:show(vim.trim(table.concat(lines, '\n')) .. '\n', chat.winnr, 'markdown')
       end)
     end,

lua/CopilotChat/init.lua

@@ -18,7 +18,6 @@ local WORD = '([^%s]+)'
 --- @field last_response string?
 --- @field chat CopilotChat.ui.Chat?
 --- @field diff CopilotChat.ui.Diff?
---- @field debug CopilotChat.ui.Debug?
 --- @field overlay CopilotChat.ui.Overlay?
 local state = {
   client = nil,
@@ -34,7 +33,6 @@ local state = {
   chat = nil,
   diff = nil,
   overlay = nil,
-  debug = nil,
 }
 
 --- Highlights the selection in the source buffer.
@@ -785,13 +783,12 @@ end
 function M.log_level(level)
   M.config.log_level = level
   M.config.debug = level == 'debug'
-  local logfile = string.format('%s/%s.log', vim.fn.stdpath('state'), PLUGIN_NAME)
+
   log.new({
     plugin = PLUGIN_NAME,
     level = level,
-    outfile = logfile,
+    outfile = M.config.log_path,
   }, true)
-  log.logfile = logfile
 end
 
 --- Set up the plugin
@@ -881,10 +878,6 @@ function M.setup(config)
     end)
   end)
 
-  if not state.debug then
-    state.debug = require('CopilotChat.ui.debug')()
-  end
-
   if state.diff then
     state.diff:delete()
   end
@@ -1023,9 +1016,6 @@ function M.setup(config)
   vim.api.nvim_create_user_command('CopilotChatReset', function()
     M.reset()
   end, { force = true })
-  vim.api.nvim_create_user_command('CopilotChatDebugInfo', function()
-    state.debug:open()
-  end, { force = true })
 
   local function complete_load()
     local options = vim.tbl_map(function(file)