Feat: Update settings tab implemented.

Auto-updates now configurable (URL, source (gitea or private server), log activity for auto updates.
fix: Update now hardened to prevent installation of corrupt or incorrect .exe files. (security to be hardened in the future)

CHANGELOG.md

@@ -6,6 +6,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ---
 
+## [1.4.3] - 2026-03-17
+
+### Added
+- Auto-updater now logs all activity to the watcher log file (`[updater]` prefix) — silent failures are now visible.
+- Configurable update source: `UPDATE_SOURCE = gitea` (default), `url`, or `disabled`. In `url` mode the watcher fetches `version.txt` and the `.exe` from a custom base URL (e.g. terra-view) instead of the Gitea API — enables updates on isolated networks that cannot reach Gitea. `disabled` turns off automatic checks while keeping the remote push path (from terra-view) functional.
+- New **Updates** tab in the Settings dialog to configure `UPDATE_SOURCE` and `UPDATE_URL`.
+
+### Fixed
+- Downloaded `.exe` is now validated before applying: absolute size floor (100 KB), relative size floor (50% of current exe), and MZ magic bytes check. A corrupt or truncated download is now rejected and logged rather than silently overwriting the live exe.
+- Swap `.bat` now backs up the current exe as `<exe>.old` before overwriting, providing a manual rollback copy if needed.
+- Swap `.bat` retry loop is now capped at 5 attempts — was previously infinite if the file remained locked.
+- Swap `.bat` now cleans up the temp download file on both success and failure.
+
 ## [1.4.2] - 2026-03-17
 
 ### Changed