Tasks

• T001 Specify and plan specs/026-board-live-refresh/.
• T002 [US1] Reproduce replacement and scroll/focus loss with native App test in crates/signaltty-gui/src/app_tests.rs.
• T003 [US1] Reconcile keyed rows/current pane targets in crates/signaltty-gui/src/board.rs and update App integration.
• T004 Extend native mutation/anchor/empty-state coverage in crates/signaltty-gui/src/app_tests.rs and inspect captures.
• T005 Resolve review, document docs/06-gui-toolkit.md and verification map; run scripts/verify.sh full.
• T006 Publish/link and merge PR after parent and checks pass. Sequential dependencies; independent read-only review.

Full gate full-19dmlviu passed40 steps/28 GTK tests. User requested merge of this PR and stop; initial attention reveal deferred. T006 remains pending until host checks and merge complete.