fix(i18n): drop spaced dashes as separators from every visible string

A dash between two parts of a sentence ("{what} — tomorrow", "Could not
record {name} — try again", "End {name} — …") stands in for a comma, a
colon or a full stop the sentence should say. Every such string in the
seven bundles now says it in plain words. A range keeps its unspaced en
dash ("70–100 mmHg", "{start}–{end}"); that is how a range is written,
not a pause, and the spaced range forms became unspaced ones.

Labels the components put together themselves follow the same rule:
aria-labels read "Move up: Ramipril", a medication and its dose read
"Ramipril 5 mg", page titles use "|", Coach prefills are two sentences,
and the API's user-facing error messages lost their dashes too.

The bundle guard now refuses " — " and " – " beside " · ", with an empty
allowlist, and a sibling guard walks src/components and src/app for a
string or template literal that joins its parts with a spaced dash.

src/app/api/admin/backups/[id]/restore/route.ts

@@ -84,7 +84,7 @@ const handler = apiHandler(
         details: { reason: "missing_confirmation", backupId: id },
       });
       return apiError(
-        "Confirmation token missing — replacing an account's data requires confirm: 'RESTORE'",
+        "Confirmation token missing. Replacing an account's data requires confirm: 'RESTORE'",
         422,
       );
     }

src/app/api/admin/central-codex/device-poll/route.ts

@@ -45,7 +45,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
     userCode = decoded.userCode;
   } catch {
     cookieStore.delete("central_codex_device");
-    return apiError("Invalid device-auth state — restart the flow", 400);
+    return apiError("Invalid device-auth state. Restart the flow", 400);
   }
 
   let result;
@@ -55,7 +55,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
     const message = err instanceof Error ? err.message : "unknown";
     annotate({ meta: { central_codex_device_poll_error: message } });
     return apiError(
-      "Central Codex device-poll failed — please restart the flow",
+      "Central Codex device-poll failed. Please restart the flow",
       502,
     );
   }