Merge branch 'feat/26-quick-settings-tiles' into release/v1.0.0

# Conflicts:
#	CHANGELOG.md
#	app/src/main/java/de/jeanlucmakiola/clockula/backup/BackupEngine.kt
#	app/src/main/java/de/jeanlucmakiola/clockula/data/backup/BackupCodec.kt
#	app/src/main/java/de/jeanlucmakiola/clockula/data/backup/BackupDto.kt
#	app/src/main/java/de/jeanlucmakiola/clockula/data/prefs/SettingsPrefs.kt
#	app/src/main/java/de/jeanlucmakiola/clockula/domain/backup/BackupContent.kt
#	app/src/main/java/de/jeanlucmakiola/clockula/ui/common/AlarmTimeFormatter.kt
#	app/src/main/java/de/jeanlucmakiola/clockula/ui/widget/NextAlarmWidgetContent.kt
#	app/src/main/res/values/strings.xml
#	app/src/test/java/de/jeanlucmakiola/clockula/ManifestRulesTest.kt
#	app/src/test/java/de/jeanlucmakiola/clockula/data/backup/BackupCodecTest.kt
#	app/src/test/java/de/jeanlucmakiola/clockula/data/prefs/SettingsPrefsTest.kt
#	docs/ARCHITECTURE.md
#	docs/BACKUP.md
#	docs/ROADMAP.md

docs/BACKUP.md

@@ -54,6 +54,10 @@ written here.
   `default_timer_volume_ramp_seconds` restores 0, the ring timers had then.
 - A missing `timer_presets` keeps the built-in presets. An empty list is a
   user who removed them all, and is imported as such.
+- A missing `quick_tile_duration_millis` (a file from before the Quick
+  Settings tiles), or one outside the quick-timer range of 1 second to 59:59,
+  keeps the quick-timer tile's default of five minutes — the same reading the
+  quick-timer widget gives its own stored duration.
 - An enum field with a name this version does not recognise (a `dismiss_
   challenge` or `theme_mode` from a future version, say) degrades to that
   field's default, the same forgiving-read posture `AlarmMapper` already uses
@@ -174,7 +178,8 @@ device or after a reboot (`docs/PLAN.md` §5). Every imported timer lands
     "hide_always_on_display": false
   },
   "screen_saver_style": "DIGITAL",
-  "screen_saver_night_mode": false
+  "screen_saver_night_mode": false,
+  "quick_tile_duration_millis": 300000
 }
 ```