feat(collector): rebuild link preview as package workspace

Inspect pasted links, text files and DLC containers before queue insertion and resolve supported hoster metadata without starting downloads. Group multipart files into expandable packages with size, status, availability, timestamps, filtering and stable selection. Add selected or complete transfer to Downloads while retaining entries on failed or partial handoff. Keep collector toolbar spacing consistent and show the full 1Fichier identity with its provider icon in Downloads.

tests/account-preload.test.ts

@@ -109,4 +109,17 @@ describe("account preload contract", () => {
     expect(electron.invoke).toHaveBeenCalledWith(IPC_CHANNELS.GET_ARCHIVE_PASSWORD_LIST);
     expect(result).toEqual({ passwords });
   });
+
+  it("forwards collector text and container inspection without adding downloads", async () => {
+    const result = { packages: [], invalidCount: 0, duplicateCount: 0 };
+    electron.invoke.mockResolvedValue(result);
+
+    await electron.api?.inspectCollectorText({ rawText: "https://1fichier.com/?abc12345", addedAt: 1234 });
+    await electron.api?.inspectCollectorContainers(["C:\\Imports\\sample.dlc"], 5678);
+
+    expect(electron.invoke.mock.calls).toEqual([
+      [IPC_CHANNELS.INSPECT_COLLECTOR_TEXT, { rawText: "https://1fichier.com/?abc12345", addedAt: 1234 }],
+      [IPC_CHANNELS.INSPECT_COLLECTOR_CONTAINERS, ["C:\\Imports\\sample.dlc"], 5678]
+    ]);
+  });
 });