feat(alarmas): replace one-line reliability button with full diagnostics screen

Surface all six DiagnosticoAlarmasAndroid fields instead of three: the
battery-optimization exemption and native pending-alarm count were
already collected but silently dropped by the old widget. Each failing
signal now offers a "Fix this" action that opens the right system
settings screen (exact alarms, notifications, full-screen intent,
battery optimization), guarded by SDK level and never crashing when a
ROM lacks that screen. Manufacturers known for aggressive background
killing (Xiaomi/Redmi/POCO, Huawei, Oppo, Vivo, OnePlus, Samsung) get
an honest explanation that Autostart must be enabled manually, since
there is no API to detect or grant it.

Notifications now deep-links straight to
ACTION_APP_NOTIFICATION_SETTINGS via a new openNotificationSettings
native method, instead of reusing the runtime permission popup meant
for first-time alarm creation.

New copy is added to all 13 ARB locales with real per-language
translations (not Spanish copies), verified by the ARB parity and
anti-copy tests plus the corruption scanner.

lib/l10n/app_zh.arb

@@ -841,5 +841,38 @@
       }
     }
   },
-  "alarmCardVacationPausedBadge": "因假期已暂停"
+  "alarmCardVacationPausedBadge": "因假期已暂停",
+  "alarmDiagnosticsExactAlarmsTitle": "精确闹钟排程",
+  "alarmDiagnosticsExactAlarmsHint": "即使手机处于休眠状态，也能让闹钟在设定的准确时间响起。",
+  "alarmDiagnosticsNotificationsTitle": "通知",
+  "alarmDiagnosticsNotificationsHint": "显示闹钟和提前提醒需要用到。",
+  "alarmDiagnosticsFullScreenTitle": "闹钟全屏显示",
+  "alarmDiagnosticsFullScreenHint": "即使手机已锁屏，也能让响铃界面自动出现。",
+  "alarmDiagnosticsBatteryTitle": "电池优化",
+  "alarmDiagnosticsBatteryHint": "防止系统在后台关闭PluriWave，让闹钟仍然可以响起。",
+  "alarmDiagnosticsNativeCountTitle": "已在Android系统注册的闹钟",
+  "alarmDiagnosticsNativeCountValue": "当前已注册：{count}",
+  "@alarmDiagnosticsNativeCountValue": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "alarmDiagnosticsNativeCountAttentionHint": "你已开启一个闹钟，但目前还没有闹钟在系统中注册。请重新打开PluriWave，或先解决上面列出的问题。",
+  "alarmDiagnosticsManufacturerLabel": "制造商",
+  "alarmDiagnosticsSdkLabel": "Android版本（SDK）",
+  "alarmDiagnosticsNeedsAttentionStatus": "需要注意",
+  "alarmDiagnosticsAutostartTitle": "此手机还需要一步手动设置",
+  "alarmDiagnosticsAutostartBody": "{manufacturer}手机经常会关闭后台运行的应用以节省电量。没有任何设置可以让PluriWave自行开启——你需要自己为PluriWave开启自启动（有时也叫\"Autostart\"或\"后台活动\"）。请在设置中查找应用或电池选项，或者查看手机自带的安全应用。",
+  "@alarmDiagnosticsAutostartBody": {
+    "placeholders": {
+      "manufacturer": {
+        "type": "String"
+      }
+    }
+  },
+  "alarmDiagnosticsFixAction": "解决",
+  "alarmDiagnosticsIntentUnavailable": "无法在此手机上打开该设置界面。请尝试在设置中手动查找。",
+  "alarmDiagnosticsUnavailableHint": "我们还无法检查你的闹钟设置。"
 }