fix: omit unchanged revision formatting details

[JSv4]

Formatting cards no longer show identical before/after attributes such as Left → Left or 0 → 0. Redundant formatting records backed by equal supplied snapshots are omitted from the list, counts, and filters.

Preserve engine-reported changes whose details are unmodeled, missing, or opaque, along with unresolved native revision diagnostics. Equal modeled values alone do not disprove a real engine change.

Validation:

• TDD regressions cover comparison/native records, changed/added/removed attributes, counts, filtering, arriving evidence, and preservation of opaque changes and diagnostics.
• npm run check: lint, 87 unit tests, library/demo builds and types, and API checks pass.
• Browser suite: 55 passed, 2 optional fixture tests skipped; comparison/studio checks also pass after review fixes.
• Adversarial review with gpt-5.6-sol; both findings reproduced with failing tests, fixed, and re-reviewed clean.

Closes #47.