feat: sync latest ARR implementation

.project-docs/50-evidence/topics/2026-07-31-company-period-card-copy.md

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+# Company-channel period card copy
+
+## Metadata
+
+- Date: 2026-07-31
+- Scope: `arr_web/static/index.html`, `arr_web/static/styles.css`, `arr_web/static/app.js`, `tests/test_arr_web.py`
+- Change type: display copy, card hierarchy and result-detail presentation
+- Business-data mutation: none
+
+## Behavior facts
+
+- The three generation cards no longer show the generic `第一期`, `第二期`, `第三期` labels.
+- The card headline values now read `C/O:01-10`, `C/O:11-20` and a month-aware final range: `C/O:21-30` for 30-day months or `C/O:21-31` for 31-day months.
+- These are display labels only. The internal period keys remain `01-10`, `11-20` and `21-month-end`; release-date
+  calculation, button enablement, confirmation context, POST payload and generation polling are unchanged.
+- Period-completeness chips (`周期未结束` / `周期已结束`) and the computed Bangkok completion time remain below each
+  C/O headline. The old duplicate C/O detail line was removed so each card has one clear range label.
+- A targeted execution check confirms June resolves to `C/O:21-30` and July resolves to `C/O:21-31`.
+- Result problems are deduplicated by kind/code/period for display; the internal warning and error arrays are not mutated.
+- The result table now shows `生成时间` from `job.finished_at`, falling back to `job.created_at`; `version_no` remains in
+  the API payload but is no longer exposed as a user-facing revision label.
+
+## Verification
+
+- `node --check arr_web/static/app.js`: passed.
+- HTML parser check: passed.
+- Focused suite: `28 tests`, `OK` (`tests.test_arr_web`, `tests.test_arr_web_company_reports`).
+- Full discovery: `348 tests`, `OK (skipped=10)`.
+- Targeted execution check: repeated same-code/same-period warnings collapse to one display item.
+- Isolated authenticated fake-server browser QA at 1280x720 and 390x844 confirmed all three labels, no stage-name
+  remnants, the requested C/O values and zero horizontal overflow. Page console warnings/errors: none. No upload,
+  extraction, deletion, activation or report generation was submitted.