fix(nav): the address follows the view through overlays, reloads and Back (review round 1)

- A URL mirror names the view again on every entry Back or Forward lands on, so a change made
  under a dialog, a drawer or a sub-view is not undone by the next reload.
- A view pushed from the entry a reload under a dialog started from no longer inherits its overlay
  mark; a reload under two overlays closes onto the page in one step.
- The linked player reopens over a live search, gives itself up when its list moves first, and
  plays alone over an emptied playlist; a capped Files list keeps the link it cannot resolve.
- The Feed press over a channel ends the search; leaving a search ends its asked mark; Files and
  Playlists searches end with their page; the feed always names its view and debounces its search.
- Search-box keys are declared per module and kept out of the client log below TRACE.
- Writers outside lib/ go through codecs; the URL contract scans computed keys, overlay writers and
  two-line reads, and holds every page to a bookmark round trip (Config, Activity, Playlists and the
  Files sort and viewer added).

frontend/src/modules/config/ConfigPanel.tsx

@@ -16,7 +16,7 @@ import SegmentedToggle from "../../components/ui/SegmentedToggle";
 import FilterSelect from "../../components/ui/FilterSelect";
 import { DraftSaveBar, type SaveState } from "../../components/ui/DraftSaveBar";
 import { LS, useTabPersistedState } from "../../lib/storage";
-import { CONFIG_TAB_KEY } from "../../lib/configTab";
+import { CONFIG_TAB_KEY, configTabParams } from "../../lib/configTab";
 import { useUrlMirror } from "../../lib/useUrlMirror";
 import { notifyActionError } from "../../lib/actionErrors";
 import { Button } from "../../components/ui/Button";
@@ -192,7 +192,7 @@ export default function ConfigPanel() {
   const activeGroup = groupKeys.includes(tab) ? tab : groupKeys[0];
   // The address names the group on screen (always: see SettingsPanel); until the registry is in, the
   // one it was opened on.
-  useUrlMirror({ [CONFIG_TAB_KEY]: (data ? activeGroup : tab) || null });
+  useUrlMirror(configTabParams((data ? activeGroup : tab) || null));
 
   if (q.isError && !data) {
     return (