fix(i18n): close the lint-invisible gaps the guard structurally cannot see (#2470)

Co-authored-by: Kandev Agent <agent@kandev.dev>

docs/i18n.md

@@ -165,7 +165,37 @@ prefix-only pattern silently never matches — write the full match.
 
 The same hazard, milder, applies to any display string that doubles as a
 comparison key or `Map` key (command-palette group names, header titles). Key off
-a stable id and translate only at render.
+a stable id and translate only at render. `kanban-header.tsx` shipped
+`title === "Home"` for a while — true only in English, and silently the wrong
+branch everywhere else.
+
+### …and to any display string that is also PERSISTED
+
+A string that is both shown to the user and written to storage cannot simply be
+wrapped in `t()`: translating it in place writes whichever locale happened to be
+active into the user's saved record, where it stays after a switch. Three places
+in the app are like this, and all three use the same split — a canonical English
+value for storage beside a catalog key for display:
+
+| Module | Persisted | Displayed |
+| --- | --- | --- |
+| `lib/state/layout-manager/constants.ts` | `PANEL_REGISTRY[id].title` | `titleKey` via `panelTitle()` |
+| `lib/layout/layout-profiles.ts` | `BUILT_IN_LAYOUT_PROFILES[i].name` | `nameKey` via `builtInLayoutProfileName()` |
+| `lib/state/slices/ui/sidebar-view-builtins.ts` | `DEFAULT_VIEW.name` | `sidebarViewName()` |
+
+Get the **direction** right, and write a test that pins it. Dockview panel
+titles pass through the serializer twice: `toSerializedDockview` feeds
+`api.fromJSON` and so must localize, while `panelFromDockviewPanel` is what
+`fromDockviewApi` captures into a saved layout and so must canonicalize. The
+first version of that split had them reversed; every unit test passed, because
+the test had been written to the same wrong model. What caught it was the
+pseudo-locale oracle — which could only see it because the layouts screen's
+`allow` list had stopped claiming those titles were expected-English.
+
+The other seeded-preset modules (`my-github/search-bar.ts`, `my-jira/presets.ts`,
+`azure-devops-workspace-defaults.ts`) are deliberately English for the same
+reason and have **not** been split, because their values are also sent to an
+agent or matched against a server-side default. Each says so in a header comment.
 
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