jvim 0.7.4

Changes

• Add normal-mode es for editing multiline JSON string values in the embedded editor panel.
• Support count prefixes such as 3es to require at least N decoded newline characters.
• Preserve nested embedded editing across es -> ej and es -> es flows.
• Add embedded string diff support in jvimdiff.
• Update README/help docs and add regression tests.

Verification

• pytest -q passed: 428 tests.
• Built jvim-0.7.4 sdist and wheel.