Modal UI/UX broken across ALL modals: content bleed-through + action-row truncation/overflow (shared modal renderer)

[Hmbown]

Summary

The confirmation/approval modal UI/UX is broken on 0.8.66. Observed on the Plan Confirmation popup but it affects the modal layer generally.

Problems (see screenshots)

1. Content bleed / no opaque backdrop. The modal does not fully mask the conversation behind it — background text shows through / around the modal, making both unreadable.
2. Action row truncated. The choices line runs off the right edge:
   [1/128 PgUp/Dn · Ctrl+U/D] [1/a] Accept [2/y] YOLO [3… ← option 3 (and beyond) is cut off and unreachable/undiscoverable.
3. Cramped layout. Title/Objective/body are tightly packed against the border with little padding; long titles wrap awkwardly.
4. Width not responsive. The modal doesn't size/wrap to the terminal width, so the footer actions overflow instead of wrapping to a second line.

Repro

• Enter Plan mode, let the model produce a plan → the Plan Confirmation modal appears with the bleed + truncated-actions problems.

Expected

• Opaque modal surface that fully covers the area behind it.
• Action/footer row wraps (or the modal widens) so every choice (Accept, YOLO, Revise, Return, etc.) is always visible and reachable.
• Consistent inner padding; responsive width with graceful wrapping.

Environment

• codewhale 0.8.66, TUI, deepseek-v4-pro
• Surface: modal/overlay layer (Plan Confirmation; likely shared modal renderer)

[Hmbown]

Scope: ALL modals, not just Plan Confirmation

This must fix the shared modal renderer so every overlay is correct, including:

• Plan Confirmation
• Approval / DESTRUCTIVE takeover (exec_shell etc.)
• Mode picker
• Hotbar setup
• Session picker / history
• Config / settings overlays
• Any ModalKind view in the view stack

Audit each ModalKind. The two systemic bugs (opaque-backdrop bleed-through + footer action-row overflow/truncation) almost certainly live in the shared modal draw path, so fixing them centrally should fix all modals at once. Add a rendering test per modal kind that asserts (a) the backdrop fully covers the area and (b) the action row fits within the modal width (wraps instead of truncating).