AddTeacherHomeRooms

# Core Features

* **Smart preflight checks**

* Blocks export if column **E** (Rooms) is entirely empty.
* Aggregates hours per room from column **D** and **stops export** if any room exceeds the weekly capacity in **H1** (shows a detailed alert).
* Validates the selected **FET** file (path/extension/loadability).

# Teacher Name Handling

* **Raw names preserved** exactly as typed in **Sheet1** (no trimming or cleaning when exporting).
* **Fuzzy matching** to FET teachers using normalization + **Levenshtein** distance to suggest the closest match.
* A helper sheet **`Teacher_Map`** appears **only when mismatches exist**; it offers a dropdown (validated list) of official FET names pulled from **`FET_Teachers`**.
* Auto-creates/updates the **`FET_Teachers`** sheet and a named range for data validation.

# FET XML Processing

* **Clears all space constraints** and **keeps only** `C