V0.3.2 Root Saves release

This is an unofficial modified build of N64FlashcartMenu V0.3.2.

For the SummerCart64, place sc64menu.n64 in the root of your SD card.
This build adds a centralized root save-folder mode while preserving the original ON and OFF behaviors.
Back up your existing save files before changing save-folder modes.

Release Notes 2026-08-23

New Features
- Added ROOT as a third option under Use Saves Folder.
- When set to ROOT, saves are loaded from and written to:
  - /saves/<ROM filename>.sav
- ROMs with identical filenames intentionally share the same root save, even when the ROMs are stored in different organizational folders.
Existing Modes
- ON: Saves are stored in a saves subfolder beside the ROM's folder.
- OFF: Saves are stored alongside the ROM.
- ROOT: All saves are stored in /saves at the root of the SD card.
Compatibility
- Existing use_saves_folder=true configurations continue to use the original ON behavior.
- Existing use_saves_folder=false configurations continue to use the original OFF behavior.
- ROOT mode is stored as use_saves_folder=root.
- Both native N64 games and emulator-backed games use the selected save-folder mode.
Bug Fixes
- Fixed a pre-existing path-memory leak when Fast Reboot is enabled on unsupported hardware.
- Generalized save-directory error handling for both local and root save directories.
Testing
- Added host tests covering:
  - Legacy configuration parsing
  - ON, OFF, and ROOT save paths
  - Save filenames containing multiple periods
  - Intentional save sharing between ROMs with identical basenames
- Tests are integrated into the GitHub Actions build.
- The menu builds successfully with the upstream pinned libdragon toolchain.

Changing the save-folder mode does not move existing saves automatically.
To continue an existing save after selecting ROOT, copy it into /saves using the same basename as the ROM.
In ROOT mode, these ROMs intentionally share one save:
- /By Genre/Racing/F-Zero X.z64
- /By Series/F-Zero/F-Zero X.z64
- Shared save: /saves/F-Zero X.sav
Save files are selected by ROM basename, not ROM contents, game ID, region, or hash.
Back up existing saves before first use.

This modified version is distributed under the GNU Affero General Public License v3.0.

Existing saves must be copied manually when changing save-folder modes.
ROOT mode deliberately causes identically named ROMs to share one save.
This build inherits the known issues documented for upstream V0.3.2:
https://github.com/Polprzewodnikowy/N64FlashcartMenu/releases/tag/V0.3.2