feat(#396): native approval UI for dangerous command, memory, and skill write requests (#397)

* feat(ws): add ApprovalRequest event type and parser

* feat(model): add ApprovalInfo field to ChatMessage

* feat(viewmodel): handle approval.request events and respondToApproval

* feat(ui): render Approve/Deny buttons for approval request messages

* test: add approval request event and respond RPC tests

* fix: add ApprovalRequest branch to ChatWsEventReducer exhaustive when

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt

@@ -105,6 +105,15 @@ object EventParser {
                 WsEvent.SessionUpdated(payload)
             }
 
+            "approval.request" -> {
+                val command = payload?.get("command") as? String
+                val description = payload?.get("description") as? String
+
+                @Suppress("UNCHECKED_CAST")
+                val patternKeys = (payload?.get("pattern_keys") as? List<*>)?.filterIsInstance<String>()
+                WsEvent.ApprovalRequest(command, description, patternKeys, sessionId)
+            }
+
             else -> {
                 Log.w(TAG, "Unknown event type: $eventType")
                 WsEvent.Unknown(rawJson)

app/src/main/java/com/m57/hermescontrol/data/ws/WsEvent.kt

@@ -85,6 +85,15 @@ sealed class WsEvent {
         val error: JsonRpcError,
     ) : WsEvent()
 
+    // ── Approval request ────────────────────────────────────────────────
+
+    data class ApprovalRequest(
+        val command: String?,
+        val description: String?,
+        val patternKeys: List<String>?,
+        val sessionId: String?,
+    ) : WsEvent()
+
     // ── Fallback ─────────────────────────────────────────────────────────
 
     data class Unknown(