refactor: organise source files by ownership

Separate host-independent helpers under common/core and colocate feature
support code with its owners. Update imports, tests, and source-layout
guidance while preserving runtime behaviour.

src/modules/features/GlobalHistory/GlobalHistoryView.ts

@@ -1,7 +1,7 @@
 import { WorkspaceLeaf } from "@/deps.ts";
 import GlobalHistoryComponent from "./GlobalHistory.svelte";
 import type ObsidianLiveSyncPlugin from "@/main.ts";
-import { SvelteItemView } from "@/common/SvelteItemView.ts";
+import { SvelteItemView } from "@/modules/coreObsidian/UI/SvelteItemView.ts";
 import { mount } from "svelte";
 
 export const VIEW_TYPE_GLOBAL_HISTORY = "global-history";