fix: harden world travel polling

.superpowers/sdd/2026-08-18-first-visible-vertical-slice/task-7-report.md

@@ -71,3 +71,53 @@ there is no repository-configured lint command to run for this task.
   this task explicitly prohibited subagents. The implementation was instead
   reviewed directly against the task brief and verified through the focused and
   complete web test/build checks above.
+
+## Review fix round 1
+
+### Findings addressed
+
+- A journey whose `arrivesAt` was already in the past made an immediate poll
+  but also installed a countdown interval. This could overlap an outstanding
+  request.
+- A late response after store destruction could still apply state and start
+  follow-on work.
+
+The store now makes a single immediate poll at local zero with no countdown
+interval. It uses one in-flight poll at a time and schedules a deliberate
+one-second retry when the server still returns `TRAVELLING` or a poll fails.
+All late async continuations check the destroy flag before changing state or
+scheduling timers. The browser still never declares arrival or changes the
+location itself.
+
+### TDD evidence
+
+```powershell
+npm test --workspace=@ashen-realms/web -- --watch=false --include='src/app/features/world/world.store.spec.ts'
+```
+
+RED result: 2 of 9 tests failed against the previous implementation. The
+already-expired test observed three calls where a pending request must allow
+only two, and the destroy test observed an unwanted second character/location
+reload after a late `COMPLETED` response.
+
+GREEN result: 1 test file passed, 9 tests passed. The expanded cases establish
+that `IDLE` and continuing `TRAVELLING` do not reload authoritative character
+or location data, expired/skewed client time remains single-flight/throttled,
+a transient poll error retries and recovers, and destruction ignores a late
+response.
+
+### Fresh verification
+
+```powershell
+npm test --workspace=@ashen-realms/web -- --watch=false
+# 3 test files passed, 13 tests passed
+
+npm run build:web
+# Angular production build completed successfully
+
+npm exec --workspace=@ashen-realms/web -- prettier --check <Task-7 files>
+# All matched files use Prettier code style
+
+git diff --check -- <Task-7 files>
+# exit 0
+```