GrayPause 1.4: grayscale color breaks for Android

Timers that switch grayscale off and restore it on their own: presets and
custom h/m/s timers, Quick Settings tile, launcher shortcuts, countdown
notification, reboot recovery, and optional always-in-color apps via an
accessibility service. WRITE_SECURE_SETTINGS is granted once via Shizuku
or adb.

Gradle project for F-Droid with fastlane metadata and a draft fdroiddata
recipe; build.sh keeps the Gradle-free on-phone Termux build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

fdroid/com.lpw.graypause.yml

@@ -0,0 +1,26 @@
+# Draft for https://gitlab.com/fdroid/fdroiddata (metadata/com.lpw.graypause.yml).
+Categories:
+  - System
+  - Theming
+License: GPL-3.0-or-later
+AuthorName: metaheavens
+SourceCode: https://metaheavens.de/forgejo/metaheavens/graypause
+IssueTracker: https://metaheavens.de/forgejo/metaheavens/graypause/issues
+
+AutoName: GrayPause
+
+RepoType: git
+Repo: https://metaheavens.de/forgejo/metaheavens/graypause.git
+
+Builds:
+  - versionName: '1.4'
+    versionCode: 5
+    commit: v1.4
+    subdir: app
+    gradle:
+      - yes
+
+AutoUpdateMode: Version
+UpdateCheckMode: Tags
+CurrentVersion: '1.4'
+CurrentVersionCode: 5