Make UI language, timestamps and live feedback consistent

docs/development/ui-patterns.md

@@ -71,3 +71,39 @@ Use the shared `--text-*` scale, with 12 px as the minimum. Mobile inputs use
 in `npm run check`, rejects raw pixel font sizes. Use Inter with tabular figures
 for counts, scores, durations and charts; reserve mono for code, IDs, paths and
 logs. Static values use text or state colors; the accent marks links and controls.
+
+### Product language
+
+| Concept | Visible label |
+| --- | --- |
+| A managed game instance | Server; use the friendly map and lobby name |
+| Creating a server | Create server |
+| Removing a server | Remove server |
+| Favourite server | Pin |
+| Game does not answer | Not responding |
+| Games | Black Ops I / Black Ops II; BO1 / BO2 in compact labels |
+| Releasing file changes | Campaigns |
+| Player completion evidence | Present in final report / Not present in final report |
+
+Keep internal values such as `t5`, `t6`, `destroy`, instance IDs, and filenames in
+API fields and technical details. User-facing actions use the labels above.
+Player presence in the final report does not establish a win or continuous
+survival. A missing timestamp is **Not recorded**, not **Never**.
+
+Use `RelativeTime` for observed history: seconds, minutes or hours for the last
+24 hours, Yesterday for the preceding calendar day, then the shared absolute
+format. It includes the full timestamp in a tooltip and follows the account's
+timezone. Scheduled future actions use `timeFormat.dateTime` directly. Database
+timestamps without an offset are UTC; never parse them as browser-local time.
+Receipt freshness uses the browser clock and shows Paused or a retry reason
+when updates are unavailable. These clocks are not live regions.
+
+Use `plural` or `countLabel` from `src/lib/ui/plural.ts` for count-dependent
+language, including verbs: `plural(count, 'needs', 'need')`. The helper uses
+`Intl.PluralRules`; supply irregular plural forms explicitly. Keep separators
+inside string expressions when a Svelte conditional would trim their leading
+space, for example `{offline ? ' · Offline' : ''}`.
+
+Recommend an agent upgrade only when its reported version is known to lack a
+needed capability. Missing calibration samples can simply mean the host is
+still collecting measurements.