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gsxdsm e923b5e84d FN-6527: add terminal shortcuts and preferences

Adds persistent terminal customization and keyboard-less navigation controls to the dashboard terminal.

- Add arrow shortcut buttons that send ANSI cursor sequences alongside existing Ctrl/Alt helpers.
- Add localStorage-backed terminal preferences for font family, size, cursor style, blink, and renderer with legacy font-size migration.
- Apply font and cursor preferences live, document renderer behavior, and cover preference parsing and modal controls with tests.

Files changed:
 docs/dashboard-guide.md                            |   3 +
 .../dashboard/app/components/TerminalModal.css     |  57 ++++-
 .../dashboard/app/components/TerminalModal.tsx     | 271 ++++++++++++++++-----
 .../components/__tests__/TerminalModal.test.tsx    | 135 +++++++++-
 .../utils/__tests__/terminalPreferences.test.ts    |  90 +++++++
 .../dashboard/app/utils/terminalPreferences.ts     | 197 +++++++++++++++
 6 files changed, 690 insertions(+), 63 deletions(-)

Fusion-Task-Id: FN-6527
Fusion-Task-Lineage: bc863486-9d2c-41d5-84a4-7b697e81a298

2026-06-17 00:06:24 -07:00