Fix: use stable GUIDs for Anki note matching on reimport

genanki's default GUID is computed from ALL fields, so adding audio to a
previously-empty Audio field changes the GUID — Anki can't match the old
note and skips the update.

Fix: explicitly set GUID from identity-only fields:
- Conjugation notes: guid_for(infinitive, pronoun, tense)
- Vocabulary notes:  guid_for(word)  [Hebrew word with nikkud]

With stable GUIDs, reimporting a rebuilt deck correctly updates existing
notes (audio, tags, corrected fields) without breaking study progress.

NOTE: users who imported a previous release will see new notes on first
reimport (old GUID → new GUID mismatch). They can delete the old untagged
notes via Browse → tag:v0.10 missing → delete.

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

apkg_builder.py

@@ -516,6 +516,9 @@ def build_vocab_deck(
 
         note = genanki.Note(
             model=VOCAB_MODEL,
+            # Stable GUID: identity = Hebrew word only, so audio/images/examples
+            # can be added on reimport without breaking note matching.
+            guid=genanki.guid_for(word),
             fields=[
                 word,
                 root,
@@ -576,6 +579,10 @@ def build_conj_deck(
                 return
             note = genanki.Note(
                 model=CONJ_MODEL,
+                # Stable GUID: identity = (infinitive, pronoun, tense) so that
+                # audio and other content fields can be updated on reimport
+                # without Anki treating the note as a new/different note.
+                guid=genanki.guid_for(infinitive, pronoun, tense),
                 fields=[
                     infinitive,
                     ref_form,