Step 7a: Bulk ID Check moves to a detached popup window

New files:
  bulk-check.html, bulk-check.js, bulk-check.css

Popup gains a 📋 launcher button next to the ⚙ Options gear. Clicking
it sends `open-bulk-check` to background.js and closes the popup;
background.js owns window lifecycle:

  - chrome.storage.session.bulkCheckWindowId stashes the open window id
  - existing id → chrome.windows.update({ focused, drawAttention })
  - missing or stale id → chrome.windows.create({ type:'popup',
    width:640, height:540 }) and stash the new id
  - chrome.windows.onRemoved clears the stale id on close

Last-paste persisted to chrome.storage.local.bulkCheckLastPaste,
debounced 500ms on input, restored on window open. quickMode is read
from settings at run time, matching previous behavior. Ctrl/Cmd+Enter
inside the textarea triggers the check.

Options page no longer carries the Bulk ID Check fieldset: removed
from options.html (Library Review pdesc updated to note the
relocation) and the matching handlers from options.js
(1903 → 1852 lines). No manifest permission changes — own-page
chrome.windows.create needs no extra permission.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

popup.js

@@ -560,6 +560,10 @@ document.getElementById("recheck").addEventListener("click", async () => {
   else runCheck(true);
 });
 document.getElementById("open-options").addEventListener("click", () => chrome.runtime.openOptionsPage());
+document.getElementById("open-bulk").addEventListener("click", () => {
+  chrome.runtime.sendMessage({ type: "open-bulk-check" });
+  window.close();
+});
 $modeLive.addEventListener("click", () => setSearchMode("live"));
 $modeCache.addEventListener("click", () => setSearchMode("cache"));
 $pauseScan.addEventListener("click", () => setScanPaused(!(settings && settings.scanPaused)));