fix: open newly created theme in editor after New Theme command

After createTheme(), the theme file was created and the sidebar navigated
to the Theme section, but the note was never opened in the editor.
Now captures the returned path and opens it via handleSelectNote.

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

src/App.tsx

@@ -330,9 +330,13 @@ function App() {
     themes: themeManager.themes, activeThemeId: themeManager.activeThemeId,
     onSwitchTheme: themeManager.switchTheme,
     onCreateTheme: async () => {
-      await themeManager.createTheme()
-      await vault.reloadVault()
+      const path = await themeManager.createTheme()
+      const freshEntries = await vault.reloadVault()
       setSelection({ kind: 'sectionGroup', type: 'Theme' })
+      if (path) {
+        const entry = freshEntries.find(e => e.path === path)
+        if (entry) notes.handleSelectNote(entry)
+      }
     },
     onOpenTheme: (themeId: string) => {
       const entry = vault.entries.find(e => e.path === themeId)

src/hooks/useVaultLoader.ts

@@ -172,8 +172,8 @@ export function useVaultLoader(vaultPath: string) {
 
   const reloadVault = useCallback(
     () => loadVaultData(vaultPath)
-      .then((data) => { setEntries(data.entries); setAllContent((prev) => ({ ...prev, ...data.allContent })); loadModifiedFiles() })
-      .catch((err) => console.warn('Vault reload failed:', err)),
+      .then((data) => { setEntries(data.entries); setAllContent((prev) => ({ ...prev, ...data.allContent })); loadModifiedFiles(); return data.entries })
+      .catch((err) => { console.warn('Vault reload failed:', err); return [] as VaultEntry[] }),
     [vaultPath, loadModifiedFiles],
   )