editor: drop the adapter import that went with backlinks

`repo` reached the editor for exactly two calls — `repo.notes.backlinks` and
`repo.notes.linkSearch` — and both left with the linking system. vue-tsc runs
with noUnusedLocals, so one stale import failed the whole shared-frontend build
and took both desktop lanes down with it (TS6133).

My local sweep checked for dangling *references*; it never checked the inverse,
that every import still has one. It does now, across all fifteen files that
removal touched — `repo` was the only one.

frontend/src/components/NoteEditor.vue

@@ -1,6 +1,5 @@
 <script setup lang="ts">
 import { computed, nextTick, onMounted, ref, watch } from "vue";
-import { repo } from "../adapters";
 import { useNotesStore } from "../stores/notes";
 import { useConfigStore } from "../stores/config";
 import ColorPicker from "./ColorPicker.vue";