refactor(tui): use command IDs for v2 keybinds

[kommander]

Summary

• define V2 keybinds directly by canonical command ID while keeping the legacy plugin shim on V1
• migrate fresh and existing CLI config keybinds with canonical precedence and JSONC preservation
• wire app, composer, diff viewer, dialog, and mini commands through resolved V2 bindings
• add mutation-verified runtime coverage for rebinding, disabling, migration, and mini config handoff

Testing

• bun turbo typecheck --concurrency=3
• TUI suite: 256 passed, 1 skipped
• CLI targeted keybind/config tests passed
• Full CLI suite: 33 passed; the existing JSON-output test still fails when an OTLP exporter diagnostic is appended to stdout