feat: schedule filters overhaul, local fonts, configurable statuses/levels

Schedule filters:
- Airbnb-style filter modal with sections: directions, trainer, status, level, days, time
- Multi-select trainer filter with search input
- Custom time range (from-to) with preset shortcuts
- Gold tag design for class types, statuses, and levels
- Hover tooltips on level/status options with descriptions from config
- Filter icon button inline with view toggle (По дням / По группам)

Admin schedule:
- Configurable experience levels and statuses (add/edit/reorder/delete)
- New scheduleConfig DB section with auto-save
- Status/level dropdowns in class editor read from config
- Status select built dynamically from config
- New status field on ScheduleClass for custom statuses

Other:
- Local fonts (Inter + Oswald) bundled in public/fonts — no Google Fonts dependency
- SelectField combobox: search in main input field, no separate search inside dropdown
- Fix carousel trainer label flash on drag release

src/components/sections/schedule/DayCard.tsx

@@ -6,8 +6,8 @@ interface DayCardProps {
   day: ScheduleDayMerged;
   typeDots: Record<string, string>;
   showLocation?: boolean;
-  filterTrainer: string | null;
-  setFilterTrainer: (trainer: string | null) => void;
+  filterTrainerSet: Set<string>;
+  toggleFilterTrainer: (trainer: string | null) => void;
   filterTypes: Set<string>;
   toggleFilterType: (type: string) => void;
 }
@@ -15,15 +15,15 @@ interface DayCardProps {
 function ClassRow({
   cls,
   typeDots,
-  filterTrainer,
-  setFilterTrainer,
+  filterTrainerSet,
+  toggleFilterTrainer,
   filterTypes,
   toggleFilterType,
 }: {
   cls: ScheduleClassWithLocation;
   typeDots: Record<string, string>;
-  filterTrainer: string | null;
-  setFilterTrainer: (trainer: string | null) => void;
+  filterTrainerSet: Set<string>;
+  toggleFilterTrainer: (trainer: string | null) => void;
   filterTypes: Set<string>;
   toggleFilterType: (type: string) => void;
 }) {
@@ -46,7 +46,7 @@ function ClassRow({
         )}
       </div>
       <button
-        onClick={() => setFilterTrainer(filterTrainer === cls.trainer ? null : cls.trainer)}
+        onClick={() => toggleFilterTrainer(cls.trainer)}
         className="mt-1.5 flex items-center gap-2 text-sm font-medium cursor-pointer active:opacity-60 text-neutral-800 dark:text-white/80"
       >
         <User size={13} className="shrink-0 text-neutral-400 dark:text-white/30" />
@@ -70,7 +70,7 @@ function ClassRow({
   );
 }
 
-export function DayCard({ day, typeDots, showLocation, filterTrainer, setFilterTrainer, filterTypes, toggleFilterType }: DayCardProps) {
+export function DayCard({ day, typeDots, showLocation, filterTrainerSet, toggleFilterTrainer, filterTypes, toggleFilterType }: DayCardProps) {
   // Group classes by location when showLocation is true
   const locationGroups = showLocation
     ? Array.from(
@@ -115,7 +115,7 @@ export function DayCard({ day, typeDots, showLocation, filterTrainer, setFilterT
               </div>
               <div className="divide-y divide-neutral-100 dark:divide-white/[0.04]">
                 {classes.map((cls, i) => (
-                  <ClassRow key={i} cls={cls} typeDots={typeDots} filterTrainer={filterTrainer} setFilterTrainer={setFilterTrainer} filterTypes={filterTypes} toggleFilterType={toggleFilterType} />
+                  <ClassRow key={i} cls={cls} typeDots={typeDots} filterTrainerSet={filterTrainerSet} toggleFilterTrainer={toggleFilterTrainer} filterTypes={filterTypes} toggleFilterType={toggleFilterType} />
                 ))}
               </div>
             </div>
@@ -125,7 +125,7 @@ export function DayCard({ day, typeDots, showLocation, filterTrainer, setFilterT
         // Single location — no sub-headers
         <div className="divide-y divide-neutral-100 dark:divide-white/[0.04]">
           {day.classes.map((cls, i) => (
-            <ClassRow key={i} cls={cls} typeDots={typeDots} filterTrainer={filterTrainer} setFilterTrainer={setFilterTrainer} filterTypes={filterTypes} toggleFilterType={toggleFilterType} />
+            <ClassRow key={i} cls={cls} typeDots={typeDots} filterTrainerSet={filterTrainerSet} toggleFilterTrainer={toggleFilterTrainer} filterTypes={filterTypes} toggleFilterType={toggleFilterType} />
           ))}
         </div>
       )}