feat: add Shift+Enter keybinding for new line in terminal (#116)

Added Shift+Enter shortcut for new line in terminal

This PR adds a keyboard shortcut (Shift+Enter) in the terminal that inserts a backslash followed by a newline, making it easier to continue commands on a new line. The change also improves type annotations for better code documentation, specifically updating the return type annotation to `snacks.terminal.Opts` and the `snacks_win_opts` type to `snacks.win.Config`.

Author: ThomasK33

lua/claudecode/terminal/snacks.lua

@@ -45,7 +45,7 @@ end
 ---@param config ClaudeCodeTerminalConfig Terminal configuration
 ---@param env_table table Environment variables to set for the terminal process
 ---@param focus boolean|nil Whether to focus the terminal when opened (defaults to true)
----@return table options Snacks terminal options with start_insert/auto_insert controlled by focus parameter
+---@return snacks.terminal.Opts opts Snacks terminal options with start_insert/auto_insert controlled by focus parameter
 local function build_opts(config, env_table, focus)
   focus = utils.normalize_focus(focus)
   return {
@@ -58,8 +58,21 @@ local function build_opts(config, env_table, focus)
       width = config.split_width_percentage,
       height = 0,
       relative = "editor",
-    }, config.snacks_win_opts or {}),
-  }
+      keys = {
+        claude_new_line = {
+          "<S-CR>",
+          function()
+            vim.api.nvim_feedkeys("\\", "t", true)
+            vim.defer_fn(function()
+              vim.api.nvim_feedkeys("\r", "t", true)
+            end, 10)
+          end,
+          mode = "t",
+          desc = "New line",
+        },
+      },
+    } --[[@as snacks.win.Config]], config.snacks_win_opts or {}),
+  } --[[@as snacks.terminal.Opts]]
 end
 
 function M.setup()

lua/claudecode/types.lua

@@ -75,7 +75,7 @@
 ---@field provider_opts ClaudeCodeTerminalProviderOptions?
 ---@field auto_close boolean
 ---@field env table<string, string>
----@field snacks_win_opts table
+---@field snacks_win_opts snacks.win.Config
 
 -- Port range configuration
 ---@class ClaudeCodePortRange