feat(frontend): Implement Voice-Guided Accessibility Mode Reading Key Loan Terms Aloud

[Dydex]

Rationale & Scope

Improve accessibility for visually impaired or low-literacy users by offering an opt-in mode that reads critical loan terms (principal, rate, term length, penalties) aloud using speech synthesis.

Concrete Tasks

• Integrate the Web Speech Synthesis API behind an opt-in accessibility toggle.
• Mark key loan-term elements with readable summaries queued for narration in a sensible order.
• Add playback controls (pause, replay, adjust speed) for the narration.

Acceptance Criteria

• Enabling the mode narrates all key loan terms in a clear, logical order.
• Playback controls correctly pause, replay, and adjust speed without restarting from the beginning unintentionally.

Suggested Branch Name

git checkout -b feat/frontend-voice-guided-accessibility