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_profile_bloc/professional_profile_bloc.dart

@@ -45,6 +45,7 @@ class ProfessionalProfileBloc
         event.longitude,
         event.schedules,
         event.paymentMethods,
+        slotDurationMinutes: event.slotDurationMinutes,
       );
 
       emit(const UpdateProfessionalInfoSuccess());

lib/blocs/professional_profile_bloc/professional_profile_event.dart

@@ -28,6 +28,7 @@ class UpdateProfessionalProfileInfo extends ProfessionalProfileEvent {
   final double longitude;
   final Schedules schedules;
   final PaymentMethodEntity paymentMethods;
+  final int slotDurationMinutes;
 
   const UpdateProfessionalProfileInfo({
     required this.address,
@@ -39,6 +40,7 @@ class UpdateProfessionalProfileInfo extends ProfessionalProfileEvent {
     required this.longitude,
     required this.schedules,
     required this.paymentMethods,
+    this.slotDurationMinutes = 120,
   });
 
   @override
@@ -51,6 +53,7 @@ class UpdateProfessionalProfileInfo extends ProfessionalProfileEvent {
         latitude,
         longitude,
         schedules,
-        paymentMethods
+        paymentMethods,
+        slotDurationMinutes,
       ];
 }