fix(collector): restore direct DLC drag imports

Resolve dropped file paths through Electron webUtils, send dragged DLC containers directly to Downloads, and keep explicit collector imports bounded so metadata enrichment cannot leave the interface permanently busy.

tests/account-preload.test.ts

@@ -4,7 +4,8 @@ import type { ElectronApi } from "../src/shared/preload-api";
 
 const electron = vi.hoisted(() => ({
   api: undefined as ElectronApi | undefined,
-  invoke: vi.fn<(...args: unknown[]) => Promise<unknown>>(async () => undefined)
+  invoke: vi.fn<(...args: unknown[]) => Promise<unknown>>(async () => undefined),
+  getPathForFile: vi.fn(() => "C:\\Imports\\dropped.dlc")
 }));
 
 vi.mock("electron", () => ({
@@ -18,7 +19,8 @@ vi.mock("electron", () => ({
     on: vi.fn(),
     removeListener: vi.fn(),
     send: vi.fn()
-  }
+  },
+  webUtils: { getPathForFile: electron.getPathForFile }
 }));
 
 describe("account preload contract", () => {
@@ -122,4 +124,12 @@ describe("account preload contract", () => {
       [IPC_CHANNELS.INSPECT_COLLECTOR_CONTAINERS, ["C:\\Imports\\sample.dlc"], 5678]
     ]);
   });
+
+  it("resolves dropped files through Electron webUtils without IPC", () => {
+    const file = { name: "dropped.dlc" } as File;
+
+    expect(electron.api?.getPathForDroppedFile(file)).toBe("C:\\Imports\\dropped.dlc");
+    expect(electron.getPathForFile).toHaveBeenCalledWith(file);
+    expect(electron.invoke).not.toHaveBeenCalled();
+  });
 });