feat(config): add Oh My Pi terminal toggle configuration

lua/config/omp_term.lua

@@ -0,0 +1,26 @@
+--- Single Oh My Pi side terminal, toggled with <C-a><C-a>.
+---
+--- `Snacks.terminal.toggle` keys terminals by cmd + window-local cwd +
+--- v:count1, so toggling from a buffer whose window has another cwd spawns a
+--- second omp. Holding the handle here keeps exactly one session; it is
+--- recreated only after the omp process exits (auto_close wipes the buffer).
+local M = {}
+
+local term ---@type snacks.win?
+
+function M.toggle()
+  if term and term:buf_valid() then
+    term:toggle()
+    return
+  end
+  term = require("snacks").terminal.open("omp", {
+    win = {
+      position = "right",
+      width = 0.4,
+      -- buffer-local, so <C-a> keeps reaching other terminals unchanged
+      keys = { omp_hide = { "<C-a><C-a>", "hide", mode = { "n", "t" }, desc = "Hide Oh My Pi" } },
+    },
+  })
+end
+
+return M