feat(#537): analytics screen — usage + per-model stats (#558)

* feat(#537): analytics screen — usage + per-model stats from /api/analytics/*

* fix(#537): address PR review — cancel-in-flight loads, retain cache on refresh, drop redundant async

* fix(#537): surface real analytics failure, mirror backend shape (period_days/tools), round-trip test

* fix(#537): tolerate float last_used_at in analytics (backend emits epoch as number)

* fix(#537): type tools[] as AnalyticsToolUsage (tool/count/percentage), render Top tools section

* fix(analytics): fix crashes and refactor tab layout

* perf(analytics): cache responses and prefetch day windows

---------

Co-authored-by: M57 <m57@hermes-control.app>

app/src/main/java/com/m57/hermescontrol/data/remote/HermesApiService.kt

@@ -6,6 +6,7 @@ import com.m57.hermescontrol.data.model.ActionStatusResponse
 import com.m57.hermescontrol.data.model.ActiveProfileResponse
 import com.m57.hermescontrol.data.model.AddMcpServerRequest
 import com.m57.hermescontrol.data.model.AgentPluginInstallBody
+import com.m57.hermescontrol.data.model.AnalyticsResponse
 import com.m57.hermescontrol.data.model.AuxiliaryModelsResponse
 import com.m57.hermescontrol.data.model.BulkDeleteRequest
 import com.m57.hermescontrol.data.model.CheckpointsResponse
@@ -45,6 +46,7 @@ import com.m57.hermescontrol.data.model.MoaConfigResponse
 import com.m57.hermescontrol.data.model.ModelAssignmentRequest
 import com.m57.hermescontrol.data.model.ModelAssignmentResponse
 import com.m57.hermescontrol.data.model.ModelOptionsResponse
+import com.m57.hermescontrol.data.model.ModelsAnalyticsResponse
 import com.m57.hermescontrol.data.model.PairingApproveRequest
 import com.m57.hermescontrol.data.model.PairingResponse
 import com.m57.hermescontrol.data.model.PairingRevokeRequest
@@ -169,6 +171,18 @@ interface HermesApiService {
     @GET("api/system/stats")
     suspend fun getSystemStats(): Response<SystemStatsResponse>
 
+    @GET("api/analytics/usage")
+    suspend fun getAnalytics(
+        @Query("days") days: Int,
+        @Query("profile") profile: String? = null,
+    ): Response<AnalyticsResponse>
+
+    @GET("api/analytics/models")
+    suspend fun getModelsAnalytics(
+        @Query("days") days: Int,
+        @Query("profile") profile: String? = null,
+    ): Response<ModelsAnalyticsResponse>
+
     @GET("api/skills")
     suspend fun getSkills(): Response<List<Skill>>