feat(import): bring the account's own mood vocabulary along

A full backup carries the account's own mood tags, rated factors and
tag groups, and the JSON import left them out: a mood entry imported
into another account landed without every link to a tag the person had
made.

Before the entries are written, every key they or the file name is
resolved once. A catalogue tag or one the account owns is used as it
is; an own tag whose label the file states differently is kept, never
overwritten, and named in keptMoodTagKeys (keptMoodCategoryKeys for a
group). A tag the file defines and the account lacks is created in its
group, the group created the same way, within the account's caps of 50
tags and 12 groups. A key another account of the server holds comes
over under a key derived from the account and the file's key, so a
second import of the same file finds the copy instead of minting
another. The links are written through that resolution, own rated
factors included, inside the entry's transaction; anything unresolved
is still dropped and named. The import card names kept keys in all
nine locales.

The field-coverage guard now holds the backup's customMoodTags and
customMoodTagCategories to the import schema. The round trip moves a
backup to another server (the same seeded catalogue, none of the
account's rows), imports it into a fresh account and compares the
re-export, own tags, group and rated factor included; a second case
imports into another account of the same server, and a third keeps a
renamed own tag.

src/app/api/import/route.ts

@@ -56,10 +56,14 @@ export const POST = apiHandler(async (request: NextRequest) => {
     stats: written,
     writeFailed,
     droppedLinkKeys,
+    keptMoodTagKeys,
+    keptMoodCategoryKeys,
   } = await runJsonImport({
     userId: user.id,
     measurements: parsed.data.measurements,
     moodEntries: parsed.data.moodEntries,
+    customMoodTagCategories: parsed.data.customMoodTagCategories,
+    customMoodTags: parsed.data.customMoodTags,
     ipAddress: getClientIp(request),
   });
   const stats = {
@@ -68,6 +72,10 @@ export const POST = apiHandler(async (request: NextRequest) => {
     // The mood links the account could not resolve, by key, only when there
     // are any: "imported" alone told the person their tags had landed.
     ...droppedLinkKeysForWire(droppedLinkKeys),
+    // The account's own tags and groups the file names differently: kept as
+    // they are, and said so, only when there are any.
+    ...(keptMoodTagKeys.length > 0 ? { keptMoodTagKeys } : {}),
+    ...(keptMoodCategoryKeys.length > 0 ? { keptMoodCategoryKeys } : {}),
   };
 
   if (writeFailed) {