feat: web UI chat render, panels, presence + analytics

frontend/src/lib/stores/ui.svelte.ts

@@ -10,9 +10,18 @@ export type RightPanel =
   | "stories"
   | "policy";
 
+export type LeftView = "main" | "settings";
+
+interface JumpTarget {
+  chatId: number;
+  messageId: number;
+}
+
 function createUi() {
   let rightPanel = $state<RightPanel | null>(null);
   let leftColumnOpen = $state(true);
+  let leftView = $state<LeftView>("main");
+  let jumpTarget = $state<JumpTarget | null>(null);
 
   return {
     get rightPanel() {
@@ -21,6 +30,24 @@ function createUi() {
     get leftColumnOpen() {
       return leftColumnOpen;
     },
+    get leftView() {
+      return leftView;
+    },
+    get jumpTarget() {
+      return jumpTarget;
+    },
+    openSettings() {
+      leftView = "settings";
+    },
+    closeSettings() {
+      leftView = "main";
+    },
+    requestJump(chatId: number, messageId: number) {
+      jumpTarget = { chatId, messageId };
+    },
+    clearJump() {
+      jumpTarget = null;
+    },
     openPanel(panel: RightPanel) {
       rightPanel = panel;
     },