fix: command input routing — single-owner keypress, Esc layer stack, exact-match ranking, safe confirm defaults

[CKGrafico]

Fixes four keystroke routing defects in the TUI board:

1. Double-handling — j/k/arrows no longer move the panel list AND type into the command bar. An InputOwner type + resolveInputOwner() determines single ownership per keypress (modal > commandBar > panel). Panel useInput hooks are gated on navActive.
2. Fuzzy Enter executes wrong command — palette ranking now puts exact/prefix matches above fuzzy subsequence matches. Typing delete focuses Delete, not Edit.
3. Escape inconsistent per surface — all Escape handling routes through a central popLayer() that closes one layer per press, topmost first. Log modal now closes on Esc (parity with q).
4. Stale input after Escape + unsafe confirm — Esc closing the dropdown also clears inputValue. Confirm prompts (quit/delete/stop) now focus cancel by default.

Verification: tsc passes clean, lint 87 errors (same as main), tests show only pre-existing failures. All new tests pass (board-state 11, tui-components 39).