[0.1.7] Filter InvalidType when warn off

[unurgunite]

Description

Hides syntax-driven Docscribe/InvalidType annotations when the "Warn on invalid YARD types" setting is off. RBS-sourced InvalidType offenses always stay visible.

Previously the toggle only controlled the --validate-types CLI flag, which gates mismatch-vs-inferred reporting in the gem. Syntax-broken YARD types are always emitted by the gem, so turning the setting off had no visible effect in the editor.

Changes:

• DocscribeAnnotator.apply skips non-RBS InvalidType offenses when the setting is off (with an info log line per skip)
• New isInvalidYardHidden helper with unit tests (setting on/off, null source, RBS source, other cops)
• Updated GUI test case 3h5 to assert the skip log line as the OFF oracle

Checklist

• Tests pass (./gradlew test — 273 tests, 0 failures, including 5 new warn-toggle tests)
• Formatting clean (./gradlew spotlessCheck)
• Static analysis clean (./gradlew detekt — fails on a clean tree too with Could not initialize class com.intellij.ide.plugins.PluginEnabler, environment issue, unrelated to this change)
• Plugin verified (./gradlew verifyPlugin — not run in this session)
• CHANGELOG updated — N/A, bug fix covered by existing changelog entry

Screenshots (if applicable)

N/A — verified live in VM (case 3h5 green: highlight plus quick-fix when on, skip log line when off).