fix(parser), test health, dead code, DI/nav and docs cleanup

[Rafael-VH]

Summary

• Fixes mlbb_parser: matches Spanish label-first total games (Partidas jugadas/totales) and stops the MVP regex from capturing across lines.
• Test health: awaits the getBadge assertion (bloc_test 10 runs verify after close()), replaces the stale counter smoke test with a boot smoke test (splash → MainScreen).
• Removes dead code: zero-import widgets/copy helpers, salomon_bottom_bar dependency.
• DI/nav consistency: drops the phantom http client, aligns totalDestinations with the real 3 destinations, moves base_usecase to core/usecases.
• Docs: removes stale Supabase and removed-module references from README.

Changes Table

Area	Change
lib/features/parser/utils/mlbb_parser.dart	Regex fixes: [\d,]+ total games, [^\S\n]* MVP separator
test/core/utils/stats_parser_test.dart	Strengthened cases (1500 total games, 320 mvpCount, KDA 4.5)
test/features/navigation/bloc/navigation_bloc_test.dart	await on badge assertion instead of verify
test/widget_test.dart	Counter smoke test replaced with boot smoke test
lib/core/widgets/**, lib/core/usecases/copy_to_clipboard.dart	Deleted zero-import dead code
lib/core/injection/injection_container.dart	Removed phantom http client, totalDestinations: 3
lib/core/usecases/base_usecase.dart	Moved from upload feature (4 imports updated)
lib/features/navigation/**	Aligned destinations, removed _PlaceholderPage
pubspec.yaml / pubspec.lock	Dropped salomon_bottom_bar
README.md	Dropped stale Supabase/removed-module references

Test Plan

• flutter test — 191/191 pass (includes parser, nav, boot smoke)
• flutter analyze — 0 errors (11 pre-existing infos)
• dart format applied

Chain Context

Field	Value
Chain	insight-offline-cleanup
Tracker PR	Not needed (2-PR chain)
Position	2 of 2
Base	refactor/remove-network-modules
Depends on	PR A (remove network modules)
Follow-up	None
Review budget	1263 changed lines (67+/1196-) / 400
Starts at	PR A head refactor/remove-network-modules
Ends with	Green suite (191/191), offline app cleaned, docs consistent

Chain Overview

main
 └── #A Remove network modules
      └── 📍 #B This PR: parser fixes + test health + cleanup + docs

Scope

• Includes: parser correctness, test suite health, dead code removal, DI/nav consistency, docs sync
• Excludes: app features, dependencies beyond salomon_bottom_bar

Autonomy

• CI-equivalent checks pass for this branch (flutter test 191/191, flutter analyze 0 errors)
• This PR has one deliverable scope (green + clean offline app)
• This PR can be rolled back by reverting the branch
• Tests/docs ship with the code they explain

size:exception rationale: both PRs exceed 400 changed lines because the diffs are atomic deletions of entire dead/network modules that cannot be sliced coherently; split chosen by maintainer at 2 deliverable units.