Route PR mention metadata by repo host

Co-authored-by: Orca <help@stably.ai>

notes/host-context-implementation-checklist.md

@@ -270,4 +270,4 @@ Done means: reviewers and future agents can understand the vision, implementatio
 - [x] 2026-06-12: Aligned Automations manual-run disabled states with the backend run-target resolver so saved run contexts now disable Run Now when the project-host setup is missing or not ready, instead of failing after dispatch. Verified with focused automation availability tests, targeted oxlint, full `pnpm run typecheck`, and `git diff --check`.
 - [x] 2026-06-12: Routed GitHub drawer label/assignee/reviewer metadata reads through the same task source context as issue/PR mutations, including slug-addressed Project view rows and reviewer request/remove actions, so same-repo multi-host drawers do not fall back to the repo owner or focused runtime. Verified with a focused source-boundary test, targeted oxlint, full `pnpm run typecheck`, and `git diff --check`.
 - [x] 2026-06-13: Tightened runtime project-host setup mutations so older remote servers that advertise `project-host-setup.v1` but not `workspace-run-context.v1` are blocked before setup/clone/create/update/delete RPCs mutate server state; read-only hydration still degrades to repo-derived compatibility rows. Verified with focused repo capability tests, targeted oxlint, full `pnpm run typecheck`, and `git diff --check`.
-- [x] 2026-06-13: Routed the full-page Pull Request metadata popovers through the PR repo owner host instead of ambient focused runtime state, so reviewer, label, and assignee reads align with the existing repo-owned mutation routing. Verified with a focused PR host-boundary test, targeted oxlint, full `pnpm run typecheck`, and `git diff --check`.
+- [x] 2026-06-13: Routed the full-page Pull Request metadata popovers and mention suggestions through the PR repo owner host instead of ambient focused runtime state, so reviewer, label, assignee, and comment-composer reads align with the existing repo-owned mutation routing. Verified with a focused PR host-boundary test, targeted oxlint, full `pnpm run typecheck`, and `git diff --check`.

src/renderer/src/components/PullRequestPage.tsx

@@ -2682,6 +2682,7 @@ function CommentCodeContext({
 function ConversationTab({
   item,
   repoPath,
+  repoId,
   body,
   comments,
   files,
@@ -2729,7 +2730,10 @@ function ConversationTab({
   const [bodySaving, setBodySaving] = useState(false)
   const bodyTextareaRef = useRef<HTMLTextAreaElement>(null)
   const bodyTextareaFocusFrameRef = useRef<number | null>(null)
-  const repoAssignees = useRepoAssignees(repoPath, item.repoId)
+  const repoOwnerSettings = useAppStore(
+    useShallow((s) => getSettingsForRepoRuntimeOwner(s, item.repoId ?? repoId ?? null))
+  )
+  const repoAssignees = useRepoAssignees(repoPath, item.repoId, repoOwnerSettings)
   const commentCounts = useMemo(() => getPRCommentAudienceCounts(comments), [comments])
   const visibleComments = useMemo(
     () => filterPRCommentsByAudience(comments, commentFilter),

src/renderer/src/components/pull-request-page-host-boundary.test.ts

@@ -40,4 +40,12 @@ describe('PullRequestPage host boundaries', () => {
     expect(section).toContain('useRepoAssigneesBySlug(')
     expect(section).toContain('repoOwnerSettings')
   })
+
+  it('routes PR mention metadata through the PR repo owner host', () => {
+    const source = componentSource('PullRequestPage.tsx')
+    const section = sourceBetween(source, 'function ConversationTab', 'const mentionOptions')
+
+    expect(section).toContain('getSettingsForRepoRuntimeOwner(s, item.repoId ?? repoId ?? null)')
+    expect(section).toContain('useRepoAssignees(repoPath, item.repoId, repoOwnerSettings)')
+  })
 })