fix(desktop): resolve unlisted project channel requests (#7619)

## Summary
- resolve project channel-creation approvals through the authoritative
home-channel selector
- permit owner-visible unlisted project homes when their channel and
repository binding match
- add regression coverage for the unlisted authoritative-home path

## Validation
- `just ci`
- focused project-home regression tests (10/10)
- full Desktop suite (6,451/6,451)
- `pnpm check`
- `pnpm build`

## Manual verification
After merging into a Desktop build, approve the pending LBX Copywriting
workroom request from the Litbox OS project.

Signed-off-by: crgallego <chris.cokerconstruction@gmail.com>
Co-authored-by: crgallego <chris.cokerconstruction@gmail.com>

desktop/src/features/projects/lib/projectHomeChannel.test.mjs

@@ -139,3 +139,19 @@ test("findProjectHomeByChannelId prefers the oldest listed authoritative home",
   ]);
   assert.equal(selected?.id, "original");
 });
+
+test("findProjectHomeByChannelId falls back to an unlisted authoritative home", () => {
+  const selected = findProjectHomeByChannelId("channel-a", [
+    {
+      createdAt: 50,
+      id: "unlisted-home",
+      legacy: false,
+      owner: OWNER,
+      projectChannelId: "channel-a",
+      repositories: [{ channelId: "channel-a", owner: OWNER }],
+      visibility: "unlisted",
+    },
+  ]);
+
+  assert.equal(selected?.id, "unlisted-home");
+});

desktop/src/features/projects/useProjectChannelRequests.ts

@@ -6,6 +6,7 @@ import { subscribeProjectChannelRequests } from "@/features/agents/observerRelay
 import { useManagedAgentsQuery } from "@/features/agents/hooks";
 import { useChannelsQuery } from "@/features/channels/hooks";
 import { useChannelTemplatesQuery } from "@/features/channel-templates/hooks";
+import { findProjectHomeByChannelId } from "@/features/projects/lib/projectHomeSelection";
 import { useProjectsQuery } from "@/features/projects/hooks";
 import type { ProjectChannelRequest } from "@/features/projects/projectChannelRequest";
 import {
@@ -103,14 +104,10 @@ export function useProjectChannelRequests() {
   const project =
     request == null
       ? null
-      : ([...(projectsQuery.data ?? [])]
-          .filter(
-            (candidate) =>
-              !candidate.legacy &&
-              candidate.visibility !== "unlisted" &&
-              candidate.projectChannelId === request.request.homeChannelId,
-          )
-          .sort((left, right) => left.createdAt - right.createdAt)[0] ?? null);
+      : findProjectHomeByChannelId(
+          request.request.homeChannelId,
+          projectsQuery.data ?? [],
+        );
   const template =
     request?.request.templateName == null
       ? null