fix(nvim): auto-insert in terminal buffers, add terminal window nav

- BufEnter term://* auto-calls startinsert so alot/abook receive keys
  immediately without needing to press i/a first (skips floaterm)
- <C-hjkl> in terminal-insert mode exits to normal then moves window,
  matching the existing normal-mode nav mappings

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nvim/init.lua

@@ -87,12 +87,28 @@ vim.opt.wildmenu       = true
 vim.opt.wildmode       = "list:longest"
 
 -- ── Keymaps ───────────────────────────────────────────────────────────────────
--- window navigation
+-- window navigation (normal mode)
 vim.keymap.set("n", "<C-l>", "<C-w>w")
 vim.keymap.set("n", "<C-h>", "<C-w>h")
 vim.keymap.set("n", "<C-j>", "<C-w>j")
 vim.keymap.set("n", "<C-k>", "<C-w>k")
 
+-- window navigation from terminal-insert mode (exit insert, then move)
+vim.keymap.set("t", "<C-h>", "<C-\\><C-n><C-w>h",  { silent = true })
+vim.keymap.set("t", "<C-j>", "<C-\\><C-n><C-w>j",  { silent = true })
+vim.keymap.set("t", "<C-k>", "<C-\\><C-n><C-w>k",  { silent = true })
+vim.keymap.set("t", "<C-l>", "<C-\\><C-n><C-w>w",  { silent = true })
+
+-- auto-enter insert mode when focusing a terminal buffer (skip floaterm)
+vim.api.nvim_create_autocmd("BufEnter", {
+    pattern  = "term://*",
+    callback = function()
+        if vim.bo.filetype ~= "floaterm" then
+            vim.cmd("startinsert")
+        end
+    end,
+})
+
 -- calendar.vim steals <C-hjkl> for month nav; restore window movement
 vim.api.nvim_create_autocmd("FileType", {
     pattern = "calendar",