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>

packages/suggestion_repository/lib/src/repositories/api_suggestion_repository.dart

@@ -0,0 +1,36 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import 'package:shared_preferences/shared_preferences.dart';
+
+const _kHttpTimeout = Duration(seconds: 20);
+
+const _base = 'https://backend.prosapp.co/api/v1';
+
+class ApiSuggestionRepository {
+  String? _token;
+
+  Future<String?> _getToken() async {
+    if (_token != null) return _token;
+    final prefs = await SharedPreferences.getInstance();
+    return _token = prefs.getString('token');
+  }
+
+  Future<Map<String, String>> _headers() async {
+    final t = await _getToken();
+    return {
+      'Content-Type': 'application/json',
+      if (t != null) 'Authorization': 'Bearer $t',
+    };
+  }
+
+  Future<void> createSuggestion(String message) async {
+    final res = await http.post(
+      Uri.parse('$_base/suggestions'),
+      headers: await _headers(),
+      body: jsonEncode({'message': message}),
+    ).timeout(_kHttpTimeout);
+    if (res.statusCode >= 400) {
+      throw Exception('No se pudo enviar la sugerencia (${res.statusCode})');
+    }
+  }
+}

packages/suggestion_repository/lib/suggestion_repository.dart

@@ -0,0 +1,3 @@
+library suggestion_repository;
+
+export 'src/repositories/api_suggestion_repository.dart';