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/profession_repository/lib/src/models/models.dart

@@ -1 +1,2 @@
 export 'profession_ui.dart';
+export 'professions.dart';

packages/profession_repository/lib/src/models/professions.dart

@@ -0,0 +1,10 @@
+import 'package:equatable/equatable.dart';
+
+class Professions extends Equatable {
+  final List<String> professions;
+
+  const Professions(this.professions);
+
+  @override
+  List<Object?> get props => [professions];
+}

packages/profession_repository/lib/src/repositories/api_profession_repository.dart

@@ -5,6 +5,8 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:profession_repository/profession_repository.dart';
 import 'profession_repo.dart';
 
+const _kHttpTimeout = Duration(seconds: 20);
+
 const _base = 'https://backend.prosapp.co/api/v1';
 
 class ApiProfessionRepository implements ProfessionRepository {
@@ -27,7 +29,7 @@ class ApiProfessionRepository implements ProfessionRepository {
       final res = await http.get(
         Uri.parse('$_base/professions'),
         headers: await _headers(),
-      );
+      ).timeout(_kHttpTimeout);
       final data = jsonDecode(res.body);
       // Backend returns either a list of profession objects or a map with a professions key
       if (data is List) {