feat(badges): search filter polish and result limit stepper

- Replace show_hidden checkbox with visibility_filter select (Default /
  Show Hidden / Show Disabled+Hidden) — collapses two orphaned boolean
  fields (show_hidden, show_not_enabled) into one purpose-built value;
  wires disabled-badge filter through to both IDB and API paths
- Add max-results stepper (edit mode only): steps of 25 up to 250,
  steps of 100 up to 2550; tier-capped (trusted=250, manager=2550);
  stepper uses pure reactivity — no handle_search_trigger() call needed
- Fix fallback liveQuery (SCENARIO 2): was hardcoded .limit(50);
  now reads qry_result_limit in outer $derived.by so Svelte tracks it
  and stepper updates the no-text browse list immediately
- Fix Search button disabled state: replace pointer-events-none +
  class:opacity-50 with HTML disabled attribute + disabled:cursor-not-allowed
  so hover cursor reflects disabled state correctly
- Global placeholder fix (app.css): add italic + opacity-0.6 rule for
  .input/.textarea ::placeholder in light mode; add italic to dark rule —
  prevents placeholder text from reading as typed content

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

src/lib/stores/ae_events_stores__badges_defaults.ts

@@ -97,8 +97,8 @@ export const default_trusted_can_edit: string[] = [
 // ---------------------------------------------------------------------------
 export interface BadgesLocState {
     auto_view: boolean;
-    show_hidden: boolean;
-    show_not_enabled: boolean;
+    // 'default' = hide hidden+disabled | 'show_hidden' = show hidden | 'show_all' = show hidden+disabled
+    visibility_filter: 'default' | 'show_hidden' | 'show_all';
     show_printed: boolean;
     allow_reprint: boolean;
     show_element__cfg: boolean;
@@ -110,6 +110,7 @@ export interface BadgesLocState {
     qry_printed_status: string; // 'all' | 'printed' | 'not_printed'
     qry_affiliations: string | null;
     qry_sort_order: string;
+    qry_result_limit: number; // UI override for max results (edit mode only; tier max enforced by stepper)
     status_qry__search: string | null;
     use_id_li: boolean;
     search_status: string | null;
@@ -158,8 +159,7 @@ export interface BadgesSessState {
 export const badges_loc_defaults: BadgesLocState = {
     auto_view: true,
 
-    show_hidden: false, // Hidden (archived) badges are excluded from the main list.
-    show_not_enabled: false,
+    visibility_filter: 'default', // 'default' | 'show_hidden' | 'show_all'
 
     show_printed: false,
     allow_reprint: false,
@@ -178,6 +178,7 @@ export const badges_loc_defaults: BadgesLocState = {
     qry_printed_status: 'all', // 'all' | 'printed' | 'not_printed'
     qry_affiliations: null, // null = no affiliation filter
     qry_sort_order: '', // '' = default sort order
+    qry_result_limit: 25,
 
     status_qry__search: null,
     use_id_li: true,