test(filters): drive the URL filter rail in a real browser

A FilterBar over useUrlFilterSync now proves the contract end to end:
a facet picked from the open menu pushes a history entry, typed input
replaces the current one, a pill's clear and Reset leave a bare URL,
two writes in a row both land, Back and an edited address re-seed the
pills, and the open menu rests inside the viewport under its pill.

The markup tests for FilterBar and useUrlFilterSync are deleted; the
popper-placement source pin is replaced by the measured menu position.
The browser project re-bundles its dependencies on every run so a
cache warmed before a new file existed cannot load a second React.

src/__tests__/baselines/test-source-reads.json

@@ -1,7 +1,7 @@
 {
   "$comment": "tests that read a source file by path, per test file under src/. Maintained by src/__tests__/test-realism-ratchet.test.ts.",
-  "count": 359,
-  "total": 359,
+  "count": 358,
+  "total": 358,
   "entries": {
     "__tests__/account-payload-consumer-guard.test.ts": 1,
     "__tests__/admin-data-wipe-completeness.test.ts": 1,
@@ -263,7 +263,6 @@
     "components/timeline/__tests__/no-template-key-guard.test.ts": 1,
     "components/ui/__tests__/card-density.test.tsx": 1,
     "components/ui/__tests__/card-header-rows.test.ts": 1,
-    "components/ui/__tests__/filter-bar.test.tsx": 1,
     "hooks/__tests__/use-insight-status.test.ts": 1,
     "lib/__tests__/geo-offline-detection.test.ts": 1,
     "lib/__tests__/query-keys.test.ts": 1,

src/__tests__/baselines/version-stamp-comments.json

@@ -1,7 +1,7 @@
 {
   "$comment": "Comment lines that open with a release version, per file under src/. Maintained by src/__tests__/version-stamp-ratchet.test.ts.",
-  "count": 2950,
-  "total": 10294,
+  "count": 2949,
+  "total": 10293,
   "entries": {
     "__tests__/account-payload-consumer-guard.test.ts": 2,
     "__tests__/acting-account-boundary-guard.test.ts": 7,
@@ -1448,7 +1448,6 @@
     "components/timeline/__tests__/timeline-view-keys.test.tsx": 1,
     "components/timeline/__tests__/value-options.test.ts": 1,
     "components/timeline/life-event-form.lazy.tsx": 1,
-    "components/ui/__tests__/filter-bar.test.tsx": 1,
     "components/ui/back-link.tsx": 1,
     "components/ui/button.tsx": 1,
     "components/ui/card.tsx": 1,