Merge detector and model in settings UI (#23216)

* add embedded mode to BaseSection so parents can host the save action

* add optional action slot to current Frigate+ model summary

* add w-full to action slot flex wrapper for explicit width contract

* i18n

* merged detectors and model settings view

* fix document title

* Embed detector form in merged settings view

* add detection model card with tabs and custom model embed

* add Frigate+ model selector with filter popover to merged page

* Add mismatch banner and gate save on detector and model compatibility

* Wire atomic save, restart toast, and undo on detectors and model page

* Clear child pending data on undo

* route merged detectors and model view in settings

* trim Frigate+ page to account-only and remove old detection model view

* basic e2e

* Fix unsaved-changes guard, custom path leak, and post-failure cache resync

* Rename to Detectors and model, float Modified badge, use ConfigMessageBanner for mismatch

* Hide Plus/Custom tabs when Frigate+ is not enabled

* Detect active Plus model via model.plus.id instead of path prefix

* Sync state back to snapshot when child form un-modifies and remount on undo

* Always require restart on save since model changes also need one

* Wrap Frigate+ model selector in SplitCardRow with label and description

* rename tab

* update docs

* sync top-level model with default detector's resolved model

when the user doesn't define a top-level `model:` block, `FrigateConfig.model` stayed at pydantic field defaults (320×320, /labelmap.txt) while the per-detector model picked up `DEFAULT_MODEL` for openvino on cpu (300×300, coco_91cl_bkgr.txt introduced in #23127), causing `RemoteObjectDetector` to fail with "buffer is too small for requested array" because the SHM was sized from the per-detector model but mapped using the top-level one. After the detector loop, copy the first detector's resolved model up to `self.model` so both sides agree on dimensions and labelmap

* revert to cpu detector by default

use openvino cpu for new configs only

* add defaults

web/public/locales/en/views/settings.json

@@ -12,6 +12,7 @@
     "globalConfig": "Global Configuration - Frigate",
     "cameraConfig": "Camera Configuration - Frigate",
     "frigatePlus": "Frigate+ Settings - Frigate",
+    "detectorsAndModel": "Detectors and model - Frigate",
     "notifications": "Notification Settings - Frigate",
     "maintenance": "Maintenance - Frigate",
     "profiles": "Profiles - Frigate"
@@ -69,8 +70,7 @@
     "systemTelemetry": "Telemetry",
     "systemBirdseye": "Birdseye",
     "systemFfmpeg": "FFmpeg",
-    "systemDetectorHardware": "Detector hardware",
-    "systemDetectionModel": "Detection model",
+    "systemDetectorsAndModel": "Detectors and model",
     "systemMqtt": "MQTT",
     "systemGo2rtcStreams": "go2rtc streams",
     "integrationSemanticSearch": "Semantic search",
@@ -1135,7 +1135,7 @@
       "loading": "Loading model information…",
       "error": "Failed to load model information",
       "noModelLoaded": "No Frigate+ model is currently loaded.",
-      "availableModels": "Available Models",
+      "availableModels": "Available Frigate+ models",
       "loadingAvailableModels": "Loading available models…",
       "selectModel": "Select a model",
       "noModelsAvailable": "No models available",
@@ -1146,6 +1146,7 @@
       },
       "modelSelect": "Your available models on Frigate+ can be selected here. Note that only models compatible with your current detector configuration can be selected."
     },
+    "changeInDetectorsAndModel": "Change model",
     "unsavedChanges": "Unsaved Frigate+ settings changes",
     "restart_required": "Restart required (Frigate+ model changed)",
     "toast": {
@@ -1153,14 +1154,30 @@
       "error": "Failed to save config changes: {{errorMessage}}"
     }
   },
-  "detectionModel": {
-    "plusActive": {
-      "title": "Frigate+ model management",
-      "label": "Current model source",
-      "description": "This instance is running a Frigate+ model. Select or change your model in Frigate+ settings.",
-      "goToFrigatePlus": "Go to Frigate+ settings",
-      "showModelForm": "Manually configure a model"
-    }
+  "detectorsAndModel": {
+    "title": "Detectors and model",
+    "description": "Configure the detector backend that runs object detection and the model it uses. Changes are saved together so the detector and model stay in sync.",
+    "cardTitles": {
+      "detector": "Detector Hardware",
+      "model": "Detection Model"
+    },
+    "tabs": {
+      "plus": "Frigate+",
+      "custom": "Custom Model"
+    },
+    "mismatch": {
+      "warning": "The current Frigate+ model \"{{model}}\" requires the {{required}} detector. Pick a compatible model below or switch to Custom Model before saving."
+    },
+    "plusModel": {
+      "requiresDetector": "Requires: {{detector}}",
+      "noModelSelected": "Select a Frigate+ model"
+    },
+    "toast": {
+      "saveSuccess": "Detectors and model settings saved. Restart Frigate to apply changes.",
+      "saveError": "Failed to save detector and model settings"
+    },
+    "unsavedChanges": "Unsaved detector and model changes",
+    "restartRequired": "Restart required (detector or model changed)"
   },
   "triggers": {
     "documentTitle": "Triggers",