fix: port 7 web features and repair the endless-loading screens

Root cause behind most "stuck loading" reports: the backend changed shape
(schedules became an array, location_preferences a string) while the mobile
parser still hard-cast to Map/int. The TypeError was swallowed by a silent
catch that returned null, and screens only handled the success state, so a
parse failure rendered as a permanent spinner. Same class of bug appeared
across service lists via non-null map lookups and a total absence of
request timeouts.

Ported from prosappweb:
- in-app suggestions (POST /suggestions)
- policies/terms from GET /settings/policies
- configurable appointment length (slot_duration_minutes)
- block/unblock calendar slots (POST /services/block)
- GPS city detection on the profile (Nominatim)
- server-side professional search with haversine distance
- retry cooldown after a rejected professional application

Reliability:
- parse schedules array (day_of_week 0=Mon) and string location_preferences
- read times as wall clock, so 08:00 stays 08:00 across timezones
- carry minutes into hours in TimeOfDay.add; a minute-based step used to
  loop forever and freeze the calendar (covered by test/time_slots_test.dart)
- semver update check instead of string equality, which blocked every build
  that did not exactly match the configured version
- request timeouts across all repositories
- surface HTTP >= 400 instead of reporting failed writes as success
- error states with retry instead of an indefinite shimmer

Includes pre-existing uncommitted work from the UI redesign.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lib/blocs/professional_list_bloc/professional_list_bloc.dart

@@ -1,3 +1,5 @@
+import 'dart:math' as math;
+
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:equatable/equatable.dart';
 import 'package:professional_repository/professional_repository.dart';
@@ -24,27 +26,76 @@ class ProfessionalListBloc
     emit(ProfessionalListLoading());
     final users = await _userRepository.getUsersProfessionalActive();
 
-    final professionals =
-        await _firebaseProfessionalRepository.getProfessionalInfo();
+    final hasSearchParams = event.search != null ||
+        event.city != null ||
+        event.lat != null ||
+        event.lng != null;
 
-    final professionalInfoMap = {for (var doc in professionals) doc.id: doc};
+    if (!hasSearchParams) {
+      final professionals =
+          await _firebaseProfessionalRepository.getProfessionalInfo();
 
-    final usersMap = users
-        .map((user) => UserProfessional(
-              myUser: user,
-              professionalInfo: professionalInfoMap[user.id]!,
+      final professionalInfoMap = {for (var doc in professionals) doc.id: doc};
+
+      final usersMap = users
+          .where((user) => professionalInfoMap.containsKey(user.id))
+          .map((user) => UserProfessional(
+                myUser: user,
+                professionalInfo: professionalInfoMap[user.id]!,
+              ))
+          .toList();
+
+      emit(ProfessionalListSuccess(users: usersMap));
+      return;
+    }
+
+    final usersDir = {for (var u in users) u.id: u};
+
+    final professionals = await _firebaseProfessionalRepository.searchProfessionals(
+      search: event.search,
+      city: event.city,
+      lat: event.lat,
+      lng: event.lng,
+    );
+
+    final usersMap = professionals
+        .where((p) => usersDir.containsKey(p.id))
+        .map((p) => UserProfessional(
+              myUser: usersDir[p.id]!,
+              professionalInfo: p,
+              distanceKm: (event.lat != null && event.lng != null)
+                  ? _haversineKm(event.lat!, event.lng!, p.latitude, p.longitude)
+                  : null,
             ))
         .toList();
 
     emit(ProfessionalListSuccess(users: usersMap));
   }
+
+  double? _haversineKm(double lat1, double lng1, double lat2, double lng2) {
+    if (lat2 == 0.0 && lng2 == 0.0) return null;
+    const r = 6371.0;
+    final dLat = (lat2 - lat1) * math.pi / 180;
+    final dLng = (lng2 - lng1) * math.pi / 180;
+    final a = math.sin(dLat / 2) * math.sin(dLat / 2) +
+        math.cos(lat1 * math.pi / 180) *
+            math.cos(lat2 * math.pi / 180) *
+            math.sin(dLng / 2) *
+            math.sin(dLng / 2);
+    return r * 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a));
+  }
 }
 
 class UserProfessional {
   final MyUser myUser;
   final ProfessionalEntity professionalInfo;
+  final double? distanceKm;
 
-  UserProfessional({required this.myUser, required this.professionalInfo});
+  UserProfessional({
+    required this.myUser,
+    required this.professionalInfo,
+    this.distanceKm,
+  });
 
   @override
   String toString() {

lib/blocs/professional_list_bloc/professional_list_event.dart

@@ -8,8 +8,18 @@ abstract class ProfessionalListEvent extends Equatable {
 }
 
 class ProfessionalListFetch extends ProfessionalListEvent {
-  const ProfessionalListFetch();
+  final String? search;
+  final String? city;
+  final double? lat;
+  final double? lng;
+
+  const ProfessionalListFetch({this.search, this.city, this.lat, this.lng});
 
   @override
-  List<Object> get props => [];
+  List<Object> get props => [
+        search ?? '',
+        city ?? '',
+        lat ?? 0,
+        lng ?? 0,
+      ];
 }