refactor(responsive): unify breakpoint names to small, medium, large, xLarge, xxLarge

[tsutsu3]

small (<700)	medium (<900)	large

[sonarqubecloud]

Quality Gate failed

Failed conditions
38.8% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 36.53846% with 33 lines in your changes missing coverage. Please review.

Project coverage is 34.43%. Comparing base (8c99958) to head (9697cbb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/screens/home/home_charts.dart	0.00%	6 Missing ⚠️
lib/screens/home/home.dart	0.00%	5 Missing ⚠️
lib/screens/settings/settings.dart	0.00%	4 Missing ⚠️
...ens/statistics/statistics_queries_servers_tab.dart	0.00%	4 Missing ⚠️
lib/base.dart	0.00%	2 Missing ⚠️
lib/screens/logs/logs_filters_modal.dart	0.00%	2 Missing ⚠️
...p_settings/advanced_settings/advanced_options.dart	33.33%	2 Missing ⚠️
lib/screens/unlock.dart	0.00%	2 Missing ⚠️
lib/screens/logs/logs.dart	66.66%	1 Missing ⚠️
lib/screens/servers/servers.dart	0.00%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   34.41%   34.43%   +0.02%     
==========================================
  Files         136      136              
  Lines        8512     8518       +6     
==========================================
+ Hits         2929     2933       +4     
- Misses       5583     5585       +2     

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