fix(ci): clear remaining base-reds on release/v3.8.50 (refs #9985) (#10749)

* fix(ci): route the Gemini Web b64_json download error through sanitizeErrorMessage()

open-sse/handlers/imageGeneration/providers/geminiWeb.ts embedded a raw
err.message in the b64_json download-failure response, tripping
check:error-helper (Hard Rule #12) on release/v3.8.50.

Refs #9985.

* fix(tests): drain test-drift base-reds left by #10603/#10537 and a stale qwen-web catalog id

Several base-reds on release/v3.8.50 (#9985) share one root cause: a legitimate
product change landed without updating the test asserting the old behavior.

- tests/unit/glm-provider-model-import-route.test.ts (12 tests) and
  tests/unit/model-sync-route.test.ts (2 tests) predate #10603, which made
  upstream model sync opt-in (isAutoFetchModelsEnabled() now requires
  providerSpecificData.autoFetchModels === true) and made manual custom-model
  overrides survive a sync instead of being demoted. Updated both files to
  opt in / assert the new preserve-manual-overrides behavior, with a comment
  citing #10603.
- tests/unit/antigravity-model-aliases.test.ts predates #10537, which retired
  the collapsed 'gemini-3.7-flash' alias (upstream 'gemini-3.7-flash-tiered')
  in favor of the three directly-callable tiered ids. Dropped the retired id
  from EXPECTED_FLASH_TIERS.
- open-sse/config/freeModelCatalog.data.ts: the qwen-web free-catalog entry
  still listed the retired 'qwen3.8-max-preview' id instead of the current
  'qwen3.8-max' (open-sse/config/providers/registry/qwen/web/index.ts and the
  executor's compat alias both confirm 'qwen3.8-max' is canonical). Real data
  drift, not test drift.
- src/i18n/messages/zh-TW.json: providers.autoFetchModelsTooltip (added by
  #10603) used the mainland term 緩存 instead of the zh-TW glossary-canonical
  快取, tripping the i18n-glossary-consistency-check base-red.
- src/lib/oauth/providers/zed-hosted.ts: removed an unused default export
  (the named export already covers every consumer) — shaves one symbol off
  the check:dead-code ratchet (419 -> 418; baseline 415, 3 still outstanding).

Refs #9985.

---------

Co-authored-by: Markus Hartung <mail@hartmark.se>

src/i18n/messages/zh-TW.json

@@ -6350,7 +6350,7 @@
     "autoFetchModels": "自動獲取上游模型",
     "autoFetchModelsDisabled": "上游模型自動獲取已禁用",
     "autoFetchModelsEnabled": "上游模型自動獲取已啟用",
-    "autoFetchModelsTooltip": "在需要時獲取並緩存上游模型",
+    "autoFetchModelsTooltip": "在需要時獲取並快取上游模型",
     "autoFetchModelsToggleFailed": "無法切換上游模型自動獲取",
     "autoFetchModelsPartialFailure": "某些連接已更新，但上游模型自動獲取並未在所有地方更改",
     "overridesUpstreamModel": "覆蓋上游",

src/lib/oauth/providers/zed-hosted.ts

@@ -126,5 +126,3 @@ export const zedHosted = {
     },
   }),
 };
-
-export default zedHosted;