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>

AGENTS.md

@@ -137,13 +137,13 @@ Done in rc-jav catalog loading. Catalog CSV/XML paths are normalized from Window
 5. **Recent Activity + Search Troubleshooting moved to new Debug Tools pane.** Verified Recent Activity is search-trigger-only by reading `background.js` — `recordActivity()` is NOT called from `delete-file` handler. No audit-value split needed. New sidebar entry "Debug Tools" under System group; new `pane-debug` houses both fieldsets.
 6. **options.js split — Cache & Scans + Duplicate Review paired extraction.** `options.js` 3133 → 2356 lines. New files: `options-cache.js` (161 lines, Cache & Scans block), `options-dupe-review.js` (616 lines, Dup Review + Keep Ranking incl. bottom `loadKeepRanking()` call). Script-tag order in `options.html`: cache → dupe-review → options.js (body bottom). Cross-script binding visibility (vanilla classic scripts share global declarative env): Library Issues code still in options.js reads `_configuredScanRoots` / `_cacheSkippedByRemote` / calls `rememberConfiguredScanRoots` from cache file by bare reference. Calls to `escapeHtml` / `openModal` / `closeModal` / `keepActionViewport` / `clearNativeRepairCard` / `renderNativeMessagingFailure` from extracted files all occur inside event handlers (resolved at call time, after options.js parses). Repo `git init`'d before this step; baseline commit `f8e781f` is the rollback point. Verified by `node --check` on each file and on concatenated script.
 6b. **options.js split — Library Issues extraction.** `options.js` 2356 → 1903 lines. New file: `options-library-issues.js` (453 lines) — covers `lastLibraryIssues`, `_libraryIssuesDirty`, `renderLibraryIssues`, `_closeLibraryIssues`, and the bottom IIFE that wraps `_optScanTimer` / `_setOptScanningState` / `_pollOptProgress` for optimization-scan progress polling. Block was fully self-contained (no external callers of its identifiers). Reads `_configuredScanRoots` / `_cacheSkippedByRemote` / calls `rememberConfiguredScanRoots` from `options-cache.js` — same cross-file binding pattern proven in step 6. Script-tag order in `options.html`: cache → dupe-review → library-issues → options.js. `node --check` passes on each file and on concatenation; line count of concat (3133) matches pre-split total exactly.
+7a. **Bulk Check standalone window.** New `bulk-check.{html,js,css}` opened as detached `chrome.windows.create({ type: 'popup', width: 640, height: 540 })`. Launcher = 📋 icon button in popup header next to ⚙ Options; click sends `open-bulk-check` message to background and closes the popup. Background owns the lifecycle: `openBulkCheckWindow()` reads `chrome.storage.session.bulkCheckWindowId`; existing id → `chrome.windows.update({ focused, drawAttention })`; failure or no id → create new window + stash id. `chrome.windows.onRemoved` clears the stale id on close. Last-paste persisted to `chrome.storage.local.bulkCheckLastPaste` (debounced 500ms), restored on window open. `quickMode` read from settings on each run (parity with old options behavior). Removed the Bulk ID Check fieldset from `options.html` (Library Review pane description updated to note the relocation) and its handlers from `options.js` (1903 → 1852 lines). No manifest permission changes needed.
 
 (Step 4 in the plan is a paired-extraction sub-task of step 6; folded into step 6 ship.)
 
 **Pending (in execution order):**
 
-- **Step 6c — finish options.js split (optional).** Remaining options.js (1903 lines) still holds: settings load/save, backup/restore, recent activity, search test bench, bulk ID check, adapters, ID normalizers, part detectors, element picker, overlay previews, diagnostics, profiles, paths, and the bottom-entry IIFE. Candidates for extraction: Diagnostics (~250 lines, 1354–1603 in current options.js), Profiles (~265 lines), Adapters + ID normalizers + Part detectors as a "rules editors" file (~330 lines combined). Diminishing returns past this point — bottom IIFE + load/save core should stay in `options.js` as the entry point.
-- **Step 7a — Bulk Check standalone window.** New `bulk-check.html` opened as detached `chrome.windows.create({ type: 'popup', width: 640, height: 540 })` from a "Bulk Check" launcher button in the popup. Single canonical entry path — NOT a Console sidebar tab. Window dedup via `chrome.storage.session`, last-paste persisted via `chrome.storage.local`.
+- **Step 6c — finish options.js split (optional).** Remaining options.js (1852 lines) still holds: settings load/save, backup/restore, recent activity, search test bench, adapters, ID normalizers, part detectors, element picker, overlay previews, diagnostics, profiles, paths, and the bottom-entry IIFE. Candidates for extraction: Diagnostics (~250 lines), Profiles (~265 lines), Adapters + ID normalizers + Part detectors as a "rules editors" file (~330 lines combined). Diminishing returns past this point — bottom IIFE + load/save core should stay in `options.js` as the entry point.
 - **Step 8 — Shared fixture corpus.** Top-level `D:\DEV\Project\rclone-jav\fixtures\` (neutral location, NOT inside Python or extension repo). JSON cases for query-ID extraction (extension), filename ID extraction (Python), shared normalization.
 - **Step 9 — Cache contract design.** CACHE_VERSION already exists (currently 3). Add ID_RULES_VERSION concept: schema bump = force rebuild, rules bump = warn-and-mark-stale.
 - **Step 10 — `rc-jav.py` module split** into `rcjav/` package (ids, cache, dupes, catalog, rclone_io, output, cli). Keep `rc-jav.py` as thin entrypoint that imports from `rcjav.cli.main`.