chore: add announce_chapter field to user_settings pb-init script

- Added announce_chapter (bool) to the user_settings create block
- Added add_field migration line for existing installs
- Also backfilled missing user_settings fields in the create block
  (theme, locale, font_family, font_size were already migrated but
  absent from the create definition)
- Migrated live prod PocketBase (pb.libnovel.cc) — field confirmed present

scripts/pb-init-v3.sh

@@ -245,12 +245,17 @@ create "user_library" '{
 
 create "user_settings" '{
   "name":"user_settings","type":"base","fields":[
-    {"name":"session_id","type":"text","required":true},
-    {"name":"user_id",  "type":"text"},
-    {"name":"auto_next","type":"bool"},
-    {"name":"voice",    "type":"text"},
-    {"name":"speed",    "type":"number"},
-    {"name":"updated",  "type":"text"}
+    {"name":"session_id",      "type":"text",  "required":true},
+    {"name":"user_id",         "type":"text"},
+    {"name":"auto_next",       "type":"bool"},
+    {"name":"voice",           "type":"text"},
+    {"name":"speed",           "type":"number"},
+    {"name":"theme",           "type":"text"},
+    {"name":"locale",          "type":"text"},
+    {"name":"font_family",     "type":"text"},
+    {"name":"font_size",       "type":"number"},
+    {"name":"announce_chapter","type":"bool"},
+    {"name":"updated",         "type":"text"}
   ]}'
 
 create "user_subscriptions" '{
@@ -345,6 +350,11 @@ add_field "app_users"      "polar_subscription_id"  "text"
 add_field "user_library"   "shelf"                  "text"
 add_field "user_sessions"  "device_fingerprint"     "text"
 add_field "chapters_idx"   "created"                "date"
+add_field "user_settings"  "theme"                  "text"
+add_field "user_settings"  "locale"                 "text"
+add_field "user_settings"  "font_family"            "text"
+add_field "user_settings"  "font_size"              "number"
+add_field "user_settings"  "announce_chapter"       "bool"
 
 # ── 6. Indexes ────────────────────────────────────────────────────────────────
 add_index "chapters_idx" "idx_chapters_idx_slug_number" \