fix(prompt): allow cancelling title input

lua/telekasten/utils.lua

@@ -0,0 +1,21 @@
+local M = {}
+
+function M.prompt_title(callback)
+    local canceledStr = "__INPUT_CANCELLED__"
+
+    vim.ui.input({
+        prompt = "Title: ",
+        default = "",
+        cancelreturn = canceledStr,
+    }, function(title)
+        if title == canceledStr then
+            vim.cmd("echohl WarningMsg")
+            vim.cmd("echomsg 'Note creation cancelled!'")
+            vim.cmd("echohl None")
+        else
+            callback(title)
+        end
+    end)
+end
+
+return M