Feature/semantic similarity (#36)

* fix: mixed up migrations

* feat: semantic similarity first take

* feat: semantic similarity first round of fixes

* feat: more work on making semantic similarity work properly

* feat: getPostBySlug for the AI

* feat: show similarity in post-link-insert-modal

* chore: remove done doc

---------

Co-authored-by: hugo <hugoms@me.com>

tests/setup.ts

@@ -156,6 +156,10 @@ Object.defineProperty(globalThis, 'window', {
         validate: vi.fn().mockResolvedValue({ valid: true, errors: [] }),
         rebuildFromFiles: vi.fn().mockResolvedValue(undefined),
       },
+      embeddings: {
+        findSimilar: vi.fn().mockResolvedValue([]),
+        computeSimilarities: vi.fn().mockResolvedValue({}),
+      },
       on: vi.fn(() => () => {}),
     },
   },