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/activity/Activity.dom.test.tsx

@@ -297,7 +297,9 @@ describe("Activity", () => {
 
   it("Back/Forward on the server log reads only the filters of the entry it lands on", async () => {
     // A browser runs the microtasks between two popstate listeners, so each listener's update
-    // renders on its own; a test dispatch does not. Each listener runs in its own act here.
+    // renders on its own; a test dispatch does not. Each listener runs in its own act here — a
+    // synchronous one: a browser runs no TASK between them (an async act let a timer set by one
+    // listener fire before the next).
     const listeners: EventListener[] = [];
     const addOther = window.addEventListener.bind(window);
     const removeOther = window.removeEventListener.bind(window);
@@ -316,7 +318,7 @@ describe("Activity", () => {
     // Forward onto a pivot's entry: one run's lines over the log's whole retention.
     window.history.pushState(null, "", "/?page=activity&at=logs&aw=90d&lrun=41");
     for (const l of [...listeners]) {
-      await act(async () => l(new PopStateEvent("popstate")));
+      act(() => l(new PopStateEvent("popstate")));
     }
     await waitFor(() =>
       expect(logsMock).toHaveBeenLastCalledWith(expect.objectContaining({ run_id: 41 }), null),

frontend/src/modules/activity/module.ts

@@ -14,4 +14,5 @@ export const activityModule: ModuleDef = {
   gate: (me) => me.role === "admin",
   Page: lazyWithPreload(() => import("./Activity")),
   urlKeys: ACTIVITY_KEYS,
+  typedUrlKeys: ["aq"],
 };