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/utils/nominatim_geocoder.dart

@@ -0,0 +1,40 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+
+class NominatimGeocoder {
+  static Future<String?> reverseGeocodeCity(double lat, double lng) async {
+    final uri = Uri.parse(
+      'https://nominatim.openstreetmap.org/reverse'
+      '?format=json&lat=$lat&lon=$lng&zoom=10&addressdetails=1',
+    );
+    final res = await http.get(
+      uri,
+      headers: {'User-Agent': 'ProsApp/1.0 (prosapp.co)'},
+    );
+    final data = jsonDecode(res.body) as Map<String, dynamic>;
+    final address = data['address'] as Map<String, dynamic>?;
+    return address?['city'] as String? ??
+        address?['town'] as String? ??
+        address?['municipality'] as String? ??
+        address?['county'] as String?;
+  }
+
+  static Future<(double lat, double lng)?> forwardGeocodeCity(
+      String cityName) async {
+    final uri = Uri.parse(
+      'https://nominatim.openstreetmap.org/search'
+      '?format=json&limit=1&q=${Uri.encodeQueryComponent(cityName)}',
+    );
+    final res = await http.get(
+      uri,
+      headers: {'User-Agent': 'ProsApp/1.0 (prosapp.co)'},
+    );
+    final data = jsonDecode(res.body) as List;
+    if (data.isEmpty) return null;
+    final first = data.first as Map<String, dynamic>;
+    final lat = double.tryParse(first['lat']?.toString() ?? '');
+    final lng = double.tryParse(first['lon']?.toString() ?? '');
+    if (lat == null || lng == null) return null;
+    return (lat, lng);
+  }
+}