Merge remote-tracking branch 'upstream/main' into pr1344

docs/CURRENT-STATE.md

@@ -3738,7 +3738,7 @@ test:track` 43 tracking invariants · headless QA harnesses under
 
 ### Interface localization (October 2026)
 
-Shipped locales: **en** (source and fallback), **es**, **ru** and **zh-CN**. The code lives in
+Shipped locales: **en** (source and fallback), **es**, **ru**, **zh-CN** and **zh-Hant**. The code lives in
 `src/i18n/`. How to mark UI text: [`docs/I18N.md`](./I18N.md); translator workflow:
 [`docs/TRANSLATORS.md`](./TRANSLATORS.md).
 
@@ -3749,8 +3749,8 @@ Shipped locales: **en** (source and fallback), **es**, **ru** and **zh-CN**. The
   value). English has no catalog; every other locale is
   `src/i18n/locales/<code>.json`, and a missing entry falls back to English.
 - **Locale choice.** `?lang=` → stored choice (`gev:locale:v1`) →
-  `navigator.languages` → English. Chinese tags map to `zh-CN`; tags containing
-  `Hant`, `TW`, `HK` or `MO` are skipped. `?lang=` is not stored, and share links drop
+  `navigator.languages` → English. Chinese tags default to `zh-CN`; Traditional Chinese tags
+  select `zh-Hant`. Explicit `Hans` selects `zh-CN` regardless of region. `?lang=` is not stored, and share links drop
   it, so a recipient keeps their own language. The globe picker in the
   bottom-right corner (`src/ui/localePicker.js`) stores the choice, drops
   `?lang=` (keeps it only when storage is blocked) and reloads. It asks first
@@ -3911,6 +3911,8 @@ reports it (`keyAlternatives`), and the panel's KEY REQUIRED, its coverage
 line and the layer row's tooltip say to light it. The
 viewer sits under the header with EXPAND, FIT/FILL and close above the
 image. SINCE is a stepped slider whose readout names the cut-off date.
+The viewer caption's bearing wraps after rounding to whole degrees, so a view
+facing 359.5° or more reads `0°` rather than `360°`.
 
 MapillaryJS loads on the first photo. Opening one frames it with a single
 camera flight through the application's deferred navigation (`begin` /

docs/TRANSLATORS.md

@@ -1,6 +1,6 @@
 # Translating God's Eye View
 
-Shipped languages: **English** (source and fallback), **Spanish** (`es`), **Russian** (`ru`) and **Simplified Chinese** (`zh-CN`).
+Shipped languages: **English** (source and fallback), **Spanish** (`es`), **Russian** (`ru`), **Simplified Chinese** (`zh-CN`) and **Traditional Chinese** (`zh-Hant`).
 
 ## How it works
 
@@ -63,4 +63,4 @@ These are contracts, not copy: layer ids and registry keys, status enums and oth
 
 ## Language notes
 
-Each language keeps its glossary, plural forms, units and style in its own file, `docs/translations/<code>.md`: [Spanish](./translations/es.md), [Russian](./translations/ru.md), [Simplified Chinese](./translations/zh-CN.md). Read it before translating, and add a term there when you settle on one.
+Each language keeps its glossary, plural forms, units and style in its own file, `docs/translations/<code>.md`: [Spanish](./translations/es.md), [Russian](./translations/ru.md), [Simplified Chinese](./translations/zh-CN.md), [Traditional Chinese](./translations/zh-Hant.md). Read it before translating, and add a term there when you settle on one.

docs/translations/zh-Hant.md

@@ -0,0 +1,17 @@
+# Traditional Chinese (`zh-Hant`)
+
+Catalog: `src/i18n/locales/zh-Hant.json`. General rules: [TRANSLATORS.md](../TRANSLATORS.md).
+
+`zh-Hant` is the Simplified Chinese catalog (`zh-CN`, credited to abiyeenzo, #914, and EDIT-Aeterna, #979) written in Traditional characters with OpenCC character conversion. Wording and terminology are the same as in `zh-CN`: change a term in [zh-CN.md](./zh-CN.md) and the `zh-CN` catalog first, then convert. Only the script differs.
+
+After `s2tw` conversion, fix the characters OpenCC picks wrongly: 年曆史 → 年歷史, 下遊 → 下游, 並道 → 併道, 發佈 → 發布, 公佈 → 公布.
+
+## Style
+
+- Follow [zh-CN.md](./zh-CN.md) for wording, punctuation, spacing, units and the glossary, written in Traditional characters.
+- Relative-time placeholders may already include 前. In `LIVE · updated {age}`, the caller supplies the complete relative age; do not append another 前.
+- The picker displays 中文（繁體） / Chinese (Traditional); explicit Hans tags select Simplified Chinese.
+
+## Plurals
+
+`Intl.PluralRules('zh-Hant')` uses only `other`. Keep the measure words of the `zh-CN` entry: 「{count} 架飛機」、「{count} 艘船」.