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/screens/lists/professional_list_screen.dart

@@ -1,8 +1,11 @@
 import 'package:user_repository/user_repository.dart';
 
+import 'dart:async';
+
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:geolocator/geolocator.dart';
 import 'package:injector/injector.dart';
 import 'package:intl_phone_field/helpers.dart';
 import 'package:profession_repository/profession_repository.dart';
@@ -34,6 +37,11 @@ class _ProfessionalListScreenState extends State<ProfessionalListScreen> {
 
   bool _isLoading = true;
 
+  double? _lat;
+  double? _lng;
+  bool _isLocating = false;
+  Timer? _debounce;
+
   late final ProfessionalListBloc bloc;
 
   @override
@@ -46,6 +54,56 @@ class _ProfessionalListScreenState extends State<ProfessionalListScreen> {
     _loadProfessions();
   }
 
+  @override
+  void dispose() {
+    _debounce?.cancel();
+    super.dispose();
+  }
+
+  void _onSearchChanged(String value) {
+    _debounce?.cancel();
+    _debounce = Timer(const Duration(milliseconds: 450), () {
+      bloc.add(ProfessionalListFetch(
+        search: value.isEmpty ? null : value,
+        lat: _lat,
+        lng: _lng,
+      ));
+    });
+  }
+
+  Future<void> _useMyLocation() async {
+    setState(() => _isLocating = true);
+    try {
+      bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
+      if (!serviceEnabled) throw Exception('Location services disabled');
+
+      LocationPermission permission = await Geolocator.checkPermission();
+      if (permission == LocationPermission.denied) {
+        permission = await Geolocator.requestPermission();
+      }
+      if (permission == LocationPermission.denied ||
+          permission == LocationPermission.deniedForever) {
+        throw Exception('Location permission denied');
+      }
+
+      final position = await Geolocator.getCurrentPosition();
+      _lat = position.latitude;
+      _lng = position.longitude;
+      bloc.add(ProfessionalListFetch(
+        search: _searchController.text.isEmpty ? null : _searchController.text,
+        lat: _lat,
+        lng: _lng,
+      ));
+    } catch (_) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('No se pudo obtener tu ubicación')),
+      );
+    } finally {
+      if (mounted) setState(() => _isLocating = false);
+    }
+  }
+
   void _loadSettings() {
     settingRepository.getSettings().then(
           (value) => setState(() {
@@ -134,14 +192,30 @@ class _ProfessionalListScreenState extends State<ProfessionalListScreen> {
                           setState(() {
                             _searchController.text = value;
                           });
+                          _onSearchChanged(value);
                         },
-                        decoration: const InputDecoration(
+                        decoration: InputDecoration(
                           hintText: 'Busca un profesional',
-                          prefixIcon: Icon(Icons.search),
-                          enabledBorder: UnderlineInputBorder(
+                          prefixIcon: const Icon(Icons.search),
+                          suffixIcon: _isLocating
+                              ? const Padding(
+                                  padding: EdgeInsets.all(14),
+                                  child: SizedBox(
+                                    width: 16,
+                                    height: 16,
+                                    child:
+                                        CircularProgressIndicator(strokeWidth: 2),
+                                  ),
+                                )
+                              : IconButton(
+                                  icon: const Icon(Icons.my_location_outlined),
+                                  tooltip: 'Usar mi ubicación',
+                                  onPressed: _useMyLocation,
+                                ),
+                          enabledBorder: const UnderlineInputBorder(
                             borderSide: BorderSide(color: Colors.grey),
                           ),
-                          focusedBorder: UnderlineInputBorder(
+                          focusedBorder: const UnderlineInputBorder(
                             borderSide: BorderSide(color: Colors.grey),
                           ),
                         ),
@@ -174,7 +248,7 @@ class _ProfessionalListScreenState extends State<ProfessionalListScreen> {
               .toLowerCase()
               .contains(removeDiacritics(_searchController.text.toLowerCase())))
           .where((user) =>
-              user.myUser.id != ApiUserRepository.currentUserId ?? '')
+              user.myUser.id != (ApiUserRepository.currentUserId ?? ''))
           .where(
               (user) => user.professionalInfo.profession == _selectedProfession)
           .toList();
@@ -226,7 +300,7 @@ class _ProfessionalListScreenState extends State<ProfessionalListScreen> {
                   );
                 },
                 child: filteredUsers[index].professionalInfo.rate.isEmpty ||
-                        settings?.tarifas == false
+                        settings?.tarifas != true
                     ? const Icon(
                         Icons.keyboard_arrow_right,
                         color: Colors.black,
@@ -295,7 +369,10 @@ class _ProfessionalListScreenState extends State<ProfessionalListScreen> {
                 ],
               ),
               subtitle: Text(
-                _disponibilidad(filteredUsers[index].professionalInfo),
+                _disponibilidad(filteredUsers[index].professionalInfo) +
+                    (filteredUsers[index].distanceKm != null
+                        ? ' · ${filteredUsers[index].distanceKm!.toStringAsFixed(1)} km'
+                        : ''),
                 style: const TextStyle(
                   fontSize: 13,
                   color: Colors.blue,