fix: wire up BlockNote uploadFile to enable image uploads in editor

The editor's useCreateBlockNote was missing the uploadFile callback,
so BlockNote had no handler for image uploads (drag-drop, paste, or
toolbar button). Images now convert to data URLs for immediate display.

In Tauri mode, uploaded images are also persisted to the vault's
attachments/ directory via a new save_image backend command.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/Editor.tsx

@@ -4,6 +4,8 @@ import { filterSuggestionItems } from '@blocknote/core/extensions'
 import { createReactInlineContentSpec, useCreateBlockNote, SuggestionMenuController } from '@blocknote/react'
 import { BlockNoteView } from '@blocknote/mantine'
 import '@blocknote/mantine/style.css'
+import { invoke } from '@tauri-apps/api/core'
+import { isTauri } from '../mock-tauri'
 import type { VaultEntry, GitCommit } from '../types'
 import { Inspector, type FrontmatterValue } from './Inspector'
 import { AIChatPanel } from './AIChatPanel'
@@ -45,6 +47,7 @@ interface EditorProps {
   onAddProperty?: (path: string, key: string, value: FrontmatterValue) => Promise<void>
   showAIChat?: boolean
   onToggleAIChat?: () => void
+  vaultPath?: string
 }
 
 // --- Custom Inline Content: WikiLink ---
@@ -147,13 +150,42 @@ export const Editor = memo(function Editor({
   inspectorEntry, inspectorContent, allContent, gitHistory,
   onUpdateFrontmatter, onDeleteProperty, onAddProperty,
   showAIChat, onToggleAIChat,
+  vaultPath,
 }: EditorProps) {
   const [diffMode, setDiffMode] = useState(false)
   const [diffContent, setDiffContent] = useState<string | null>(null)
   const [diffLoading, setDiffLoading] = useState(false)
 
+  // Ref for vaultPath so the uploadFile closure always sees the latest value
+  const vaultPathRef = useRef(vaultPath)
+  vaultPathRef.current = vaultPath
+
   // Single editor instance — reused across all tabs
-  const editor = useCreateBlockNote({ schema })
+  const editor = useCreateBlockNote({
+    schema,
+    uploadFile: async (file: File) => {
+      const dataUrl = await new Promise<string>((resolve, reject) => {
+        const reader = new FileReader()
+        reader.onload = () => resolve(reader.result as string)
+        reader.onerror = () => reject(reader.error)
+        reader.readAsDataURL(file)
+      })
+
+      // In Tauri mode, also persist the file to the vault's attachments directory
+      if (isTauri() && vaultPathRef.current) {
+        const base64 = dataUrl.split(',')[1]
+        if (base64) {
+          invoke('save_image', {
+            vaultPath: vaultPathRef.current,
+            filename: file.name,
+            data: base64,
+          }).catch(err => console.warn('Failed to save image to vault:', err))
+        }
+      }
+
+      return dataUrl
+    },
+  })
   // Cache parsed blocks per tab path for instant switching
   const tabCacheRef = useRef<Map<string, any[]>>(new Map())
   const prevActivePathRef = useRef<string | null>(null)