chore: restructure llm plugin to be more coherent & fix various bugs in llm ui

Modules/Notifications/Sidebar/Chat/SidebarView.qml

@@ -65,9 +65,7 @@ Item {
 			}
 		}
 
-		model: ScriptModel {
-			values: Chat.chats.values
-		}
+		model: LlmClient.chats
 
 		onLoadChatRequest: (chat, index) => {
 			ChatState.currentIdx = index;
@@ -75,17 +73,13 @@ Item {
 		}
 
 		onDeleteChatRequest: chat => {
-			if (chat === ChatState.chatSession) {
-				ChatState.chatSession = null;
-				ChatState.currentIdx = -1;
-			}
-			Chat.chats.remove(chat);
-		}
-		onNewChatRequest: {
-			const data = Chat.chats.insert();
-			ChatState.currentIdx = 0;
-			ChatState.chatSession = data;
+			const wasCurrent = chat === ChatState.chatSession;
+			LlmClient.chats.remove(chat);
+
+			if (wasCurrent)
+				ChatState.openDraft();
 		}
+		onNewChatRequest: ChatState.openDraft()
 
 		onRequestExpand: {
 			ChatState.narrowSidebarExpanded = true;
@@ -157,30 +151,6 @@ Item {
 				root.chatOpen = true
 		}
 
-		ColumnLayout {
-			id: noChatLayout
-			anchors.centerIn: parent
-			opacity: ChatState.chatSession ? 0 : 1
-			visible: opacity > 0
-
-			Behavior on opacity {
-				Anim {}
-			}
-
-			MaterialIcon {
-				Layout.alignment: Qt.AlignCenter
-				text: "chat_bubble_off"
-				fontStyle: Tokens.font.icon.extraLarge
-				color: Colors.tPalette.m3onSurfaceVariant
-			}
-
-			CustomText {
-				Layout.alignment: Qt.AlignCenter
-				text: qsTr("Start or create a chat")
-				color: Colors.tPalette.m3onSurfaceVariant
-			}
-		}
-
 		MouseArea {
 			id: dimArea
 			anchors.fill: parent
@@ -192,8 +162,10 @@ Item {
 				const x = mouseX;
 				const margin = root.width - contentArea.implicitWidth - contentArea.anchors.margins * 2;
 
-				if (x > invertedRect.borderLeft - margin)
+				if (x > invertedRect.borderLeft - margin) {
 					ChatState.narrowSidebarExpanded = false;
+					ChatState.fabExpanded = false;
+				}
 			}
 
 			HoverHandler {