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>

pubspec.yaml

@@ -6,7 +6,7 @@ publish_to: "none"
 version: 1.0.14+14
 
 environment:
-  sdk: ">=2.19.3 <3.0.0"
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   animate_do: ^3.0.2
@@ -60,6 +60,8 @@ dependencies:
     path: packages/setting_repository
   shared_preferences: ^2.0.10
   shimmer: ^3.0.0
+  suggestion_repository:
+    path: packages/suggestion_repository
   table_calendar: ^3.1.1
   universal_html: ^2.2.3
   url_launcher: ^6.1.10
@@ -70,6 +72,8 @@ dependencies:
 
 dev_dependencies:
   flutter_lints: ^4.0.0
+  flutter_test:
+    sdk: flutter
 
 flutter:
   uses-material-design: true