fix(i18n): close the last three zh-branch gaps (#2871, part 3)

[os-zhuang]

Part 3 of #2871, after #2887 and #2893. These are the three items the classification marked as real but not a migrate-the-copy fix — each needed a different remedy, which is why they were held back from the earlier parts.

1. LoadingScreen — ten languages collapsed to two

The boot splash already selected real locale packs (not inline copy), so it wasn't in the pick() cluster. But it chose via lang.startsWith('zh') ? zh : en, so a ja/ko/de user watched the entire startup in English.

Now indexes builtInLocales by two-letter prefix — but with a per-field fallback to en, which is the part that matters:

return {
  ...enLocale.console,
  ...pack,
  loadingSteps: { ...enLocale.console.loadingSteps, ...pack.loadingSteps },
  …
};

console.* is one of the namespaces trailing in the non-zh packs (#2872 part a), so a whole-object swap would have rendered undefined on the splash rather than English. I checked every key this component reads across all ten packs before writing it, and console.loadingHint was in fact missing from all eight — added here, because a blank line under the progress list is worse than an English one.

The useObjectTranslation ban stays: this renders before i18next initialises, and on a server-down boot i18n can't load at all.

2. containers.tsx — two language sources that could disagree

The tab-label call sites resolved language from useObjectTranslation(), then passed the string to translateLabel, which called detectLocale() and read document.documentElement.lang itself. Those two update independently, so an in-app language switch could leave a tab label and the chrome around it in different languages until the next reload.

language is now threaded in, and detectLocale is deleted so nothing in this file reaches for the DOM again. KNOWN_LABEL_DICT and the '与' CJK separator stay — per the classification, normalising author-supplied schema data is legitimate and is not UI copy.

3. field-types.ts — a two-language data catalog

FieldTypeMeta carried a labelZh column beside label, which capped the field-type picker at English-or-Chinese by construction. The 46 type names and 9 category names move into the Studio catalog as engine.fieldType.<id> / engine.fieldCategory.<cat>.

I generated those 110 entries from the existing values rather than retyping them, so no wording drifts in this change.

This is what removes isZh from both ObjectFieldInspector and ObjectFormCanvas — the two files the classification listed as "keep the component, fix the catalog". labelZh, CATEGORY_LABEL_ZH, and the unknown-type fallback's Chinese '未知' are all gone with it.

Caught while in there: the picker's search filter matched id, the English label, and labelZh — so typing a Japanese or German field-type name matched nothing. It now matches the label as the user actually sees it.

Verification

Full suite 7730 passed, 1 skipped, 0 failed. ESLint errors identical to baseline (25, all pre-existing). turbo type-check 31/31 on the changed packages.

One thing worth flagging from the type-check: my first version annotated getStartupStrings(): typeof enLocale.console, which failed because en's literal-typed consts don't accept another pack's widened strings. Dropping the annotation and letting TS infer is correct — the consumers only read strings.

Where #2871 stands after this

All 7 genuine bugs are fixed across parts 1–3. What remains under that issue is only the deliberate keeps: conversationLanguage (detects the chat's language for the agent), the Studio catalog itself (1375 keys, ~1255 call sites — a multi-week refactor with no user-visible gain), and KNOWN_LABEL_DICT. I'd suggest closing #2871 once this lands.

🤖 Generated with Claude Code

https://claude.ai/code/session_01TubWYdWquVkS9dj733sDmC

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Generated by Claude Code

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✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	27.9 KB	350 KB
Entry file	index-BDbdB_xJ.js	—
Status	PASS	—

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📦 Bundle Size Report

Package	Size	Gzipped
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auth (index.js)	2.17KB	0.96KB
auth (org-roles.js)	5.50KB	2.36KB
auth (phone-identifier.js)	1.11KB	0.66KB
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mobile (breakpoints.js)	1.51KB	0.70KB
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types (overlay.js)	0.20KB	0.18KB
types (permissions.js)	0.20KB	0.18KB
types (plugin-scope.js)	0.20KB	0.18KB
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types (reports.js)	0.20KB	0.18KB
types (spec-report.js)	5.04KB	1.93KB
types (system-fields.js)	2.39KB	1.17KB
types (theme.js)	0.20KB	0.18KB
types (ui-action.js)	0.75KB	0.46KB
types (views.js)	0.20KB	0.18KB
types (widget.js)	0.20KB	0.18KB

Size Limits

• ✅ Core packages should be < 50KB gzipped
• ✅ Component packages should be < 100KB gzipped
• ⚠️ Plugin packages should be < 150KB gzipped