Upgrade snap_diff-capybara to 2.0.0.beta4

[pftg]

Summary

Migrate visual-regression testing off the git-source capybara-screenshot-diff (1.12.0) to the RubyGems snap_diff-capybara 2.0.0.beta4, and adopt the canonical SnapDiff namespace before 2.1 removes the v1 API.

Why

2.0 fixes four separate ways a 1.15.1 suite could pass green while comparing nothing (uncommitted baselines, inherited GIT_DIR, stale libvips pixels, lost HTML report under parallel tests) and prints an honest [snap_diff] N verified, N changed, N new (not verified). summary on every run. The v1 Capybara::Screenshot::Diff.* API is a same-object shim in 2.0 and is deleted in 2.1.

Changes

• Gemfile / Gemfile.lock — gem "snap_diff-capybara", "2.0.0.beta4" (drop the git source)
• test/support/setup_snap_diff.rb — Capybara::Screenshot::Diff.* → SnapDiff.config.*; canonical requires (snap_diff/integrations/minitest, snap_diff/reporters/html); fail_if_new → record = :none / :all; drop the driver knob (libvips is the only 2.1 backend)
• test/application_system_test_case.rb — SnapDiff::Os, SnapDiff::DSL, SnapDiff::Minitest::Assertions
• .github/workflows/test.yml — bump both CI action pins to the v2.0.0.beta4 tag commit; unset CI on the record-baselines step so record = :all (bulk re-record) isn't refused under GitHub Actions
• .okf / README / bin/dtest — update the [snap_diff] summary-line reading rule and config references to the 2.0 format

Verification

• bin/test (critical suite) green: 38 runs, 126 assertions, 0 failures — [snap_diff] 55 verified, 0 changed, 0 new (not verified)., zero deprecation warnings
• bin/record-baselines in record = :all mode: 81 runs, 245 assertions, 0 failures — [snap_diff] 0 verified, 0 changed, 0 new. 134 re-recorded (not verified)., tree reconciled clean
• Load smoke confirmed no v1 Capybara::Screenshot* references remain in test/

Notes

• The linux/ leg still needs its own run (CI container) — this only ran the macOS local gate.
• No independent reviewer tooling was available in this session; the change is self-verified against the two local gates above.

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