🧹 [Refactor initDataAndEngine] Extract initialization logic into smaller functions

The `initDataAndEngine` function in `src/main.ts` was extremely long and handled the initialization of multiple loosely related components (engine, data, extensions, workspace, editor, and search controller).

This commit extracts those distinct responsibilities into their own smaller, self-contained functions (`initEngine`, `initData`, `initExtensions`, `initWorkspace`, `initEditor`, and `initSearchController`), which are now sequentially called by the original `initDataAndEngine` function.

This improves maintainability and readability without altering the underlying logic or initialization order.

Co-authored-by: Horizontal42 <75383519+Horizontal42@users.noreply.github.com>

src/main.ts

@@ -940,14 +940,16 @@ async function initSettings(): Promise<void> {
   await runBackups(settings.dataDir, settings.deletedRetentionDays);
 }
 
-async function initDataAndEngine(): Promise<void> {
+function initEngine(): void {
   engine = new SumEngine({
     precision: settings.precision,
     groupSeparator: settings.groupSeparator,
     decimalSeparator: settings.decimalSeparator,
     dateFormat: settings.dateFormat,
   });
+}
 
+async function initData(): Promise<void> {
   const stored = await loadAppData(settings.dataDir);
   // a corrupt or foreign documents.json must not crash the boot
   if (
@@ -968,10 +970,14 @@ async function initDataAndEngine(): Promise<void> {
   }
   if (!data.docs.some((d) => d.id === data.activeId))
     data.activeId = data.docs[0].id;
+}
 
+async function initExtensions(): Promise<void> {
   const scripts = await loadExtensionScripts();
   await runExtensions(engine, scripts);
+}
 
+function initWorkspace(): void {
   workspace = new Workspace(engine, () =>
     data.docs.map((d) => ({
       id: d.id,
@@ -979,7 +985,9 @@ async function initDataAndEngine(): Promise<void> {
       text: data.contents[d.id] ?? "",
     })),
   );
+}
 
+function initEditor(): void {
   editor = new SumEditor(
     $("#editor"),
     $("#results"),
@@ -1016,7 +1024,9 @@ async function initDataAndEngine(): Promise<void> {
   // the editor above was seeded directly with initialText (not via switchDoc),
   // so a reopened sheet with "on 2024-01-01" needs its own historical-rate fetch
   void fetchNeededHistoricalRates(data.contents[data.activeId] ?? "");
+}
 
+function initSearchController(): void {
   search = initSearch({
     engine,
     workspace,
@@ -1034,6 +1044,15 @@ async function initDataAndEngine(): Promise<void> {
   });
 }
 
+async function initDataAndEngine(): Promise<void> {
+  initEngine();
+  await initData();
+  await initExtensions();
+  initWorkspace();
+  initEditor();
+  initSearchController();
+}
+
 function bindTitleUI(): void {
   const titleField = $<HTMLInputElement>("#doc-title");
   titleField.addEventListener("change", () => {