Shift-Tab walks backwards through the questions, with wrap, the same
way Tab walks forward. A locked answer now renders on its own indented
line in a distinct color under its question, instead of an arrow
suffix on the status line, so the current answers stay readable while
the cursor moves.
A re-visited question restores its earlier state: a choice answer puts
the cursor back on that choice, a typed answer highlights the Other
row and shows the typed text next to it. Enter on an answered Other
switches to freetext with the composer prefilled with the earlier
text, so the user edits instead of retyping. Answer metadata records
how each answer was produced to drive the restore.
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