Split oversized TUI views and CLI command files

[franconicola]

Problem.
Several TUI / CLI files exceed 1 kLOC, mixing rendering, event handling, and business logic.

Targets.

• cli/tui/views/results.py — ~2,479 lines
• cli/tui/attack_specs.py — ~1,377 lines
• cli/tui/views/attacks.py — ~1,318 lines
• cli/commands/attack.py — ~884 lines

Actions.

• For each TUI file: extract widgets to siblings (screens/, widgets/), keep top-level files as routers.
• For cli/commands/attack.py: split into parse_config() (pure, testable) and run_attack() (uses HackAgent). Both reusable from the TUI.
• Add textual snapshot tests for any newly extracted screens.

Acceptance: no file in cli/ exceeds 600 lines; parse_config is unit-tested; TUI snapshot tests added.