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+```mermaid
+%% ROUTER Mode Data Flow (multi-model)
+%% Detailed flows: ./flows/server-flow.mmd, ./flows/models-flow.mmd, ./flows/chat-flow.mmd
+
+sequenceDiagram
+    participant User as 👤 User
+    participant UI as 🧩 UI
+    participant Stores as 🗄️ Stores
+    participant DB as 💾 IndexedDB
+    participant API as 🌐 llama-server
+
+    Note over User,API: 🚀 Initialization (see: server-flow.mmd, models-flow.mmd)
+
+    UI->>Stores: initialize()
+    Stores->>DB: load conversations
+    Stores->>API: GET /props
+    API-->>Stores: {role: "router"}
+    Stores->>API: GET /v1/models
+    API-->>Stores: models[] with status (loaded/available)
+    loop each loaded model
+        Stores->>API: GET /props?model=X
+        API-->>Stores: modalities (vision/audio)
+    end
+
+    Note over User,API: 🔄 Model Selection (see: models-flow.mmd)
+
+    User->>UI: select model
+    alt model not loaded
+        Stores->>API: POST /models/load
+        loop poll status
+            Stores->>API: GET /v1/models
+            API-->>Stores: check if loaded
+        end
+        Stores->>API: GET /props?model=X
+        API-->>Stores: cache modalities
+    end
+    Stores->>Stores: validate modalities vs conversation
+    alt valid
+        Stores->>Stores: select model
+    else invalid
+        Stores->>API: POST /models/unload
+        UI->>User: show error toast
+    end
+
+    Note over User,API: 💬 Chat Flow (see: chat-flow.mmd)
+
+    User->>UI: send message
+    UI->>Stores: sendMessage()
+    Stores->>DB: save user message
+    Stores->>API: POST /v1/chat/completions {model: X}
+    Note right of API: router forwards to model
+    loop streaming
+        API-->>Stores: SSE chunks + model info
+        Stores-->>UI: reactive update
+    end
+    API-->>Stores: done + timings
+    Stores->>DB: save assistant message + model used
+
+    Note over User,API: 🔁 Regenerate (optional: different model)
+
+    User->>UI: regenerate
+    Stores->>Stores: validate modalities up to this message
+    Stores->>DB: create message branch
+    Note right of Stores: same streaming flow
+
+    Note over User,API: ⏹️ Stop
+
+    User->>UI: stop
+    Stores->>Stores: abort stream
+    Stores->>DB: save partial response
+
+    Note over User,API: 🗑️ LRU Unloading
+
+    Note right of API: Server auto-unloads LRU models<br/>when cache full
+    User->>UI: select unloaded model
+    Note right of Stores: triggers load flow again
+```