perf: reduce startup work and fix grade analytics bar chart animation

Batch settings storage writes, tier plugin startup, lazy-load heavy UI
chunks, and optimize global search indexing. Stop tweening bar height in
grade analytics to prevent invalid negative SVG rect values.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/seqta/ui/renderStore.ts

@@ -1,26 +1,27 @@
-import renderSvelte from "@/interface/main";
-import Store from "@/interface/pages/store.svelte";
-
 import { unmount } from "svelte";
 
 let remove: () => void;
 
-export function OpenStorePage() {
-  remove = renderStore();
+export async function OpenStorePage(): Promise<void> {
+  remove = await renderStore();
 }
 
-export function renderStore() {
+export async function renderStore() {
+  const [{ default: renderSvelte }, { default: Store }] = await Promise.all([
+    import("@/interface/main"),
+    import("@/interface/pages/store.svelte"),
+  ]);
+
   const container = document.querySelector("#container");
   if (!container) {
     throw new Error("Container not found");
   }
 
-  // Avoid stacking multiple store roots if opened repeatedly without close.
   document.getElementById("store")?.remove();
 
   const child = document.createElement("div");
   child.id = "store";
-  container!.appendChild(child);
+  container.appendChild(child);
 
   const shadow = child.attachShadow({ mode: "open" });
   const app = renderSvelte(Store, shadow);