feat: add personas voices CLI command (API parity)

[callumreid]

Summary

Adds voices subcommand to coval personas.

What's New

• coval personas voices — list all available voices with supported languages

Matches GET /v1/personas/voices endpoint.

Verification

$ coval personas voices
╭────────────┬──────────────────────────────────────────────────────╮
│ Voice Name │ Supported Languages                                  │
├────────────┼──────────────────────────────────────────────────────┤
│ aria       │ bg-BG, da-DK, en-AU, en-IN, en-GB, en-US, fr-CA, ... │
│ ashwin     │ bg-BG, da-DK, en-AU, en-IN, en-GB, en-US, fr-CA, ... │
...

• cargo build ✓ - cargo test 90/90 ✓

Greptile Summary

This PR adds a voices subcommand to coval personas, hitting GET /v1/personas/voices and rendering results as a table. The implementation follows the same patterns used by PhoneNumbers and other list commands already in the codebase.

• New Voice model and ListVoicesResponse in persona.rs, with #[serde(flatten)] for forward-compatibility with unknown API fields.
• PersonasClient::list_voices added to client/mod.rs, wired into the PersonaCommands::Voices match arm in commands/personas.rs.

Confidence Score: 5/5

Safe to merge — the change is an additive read-only command with no side effects and follows established patterns throughout the codebase.

The new command is a straightforward read-only addition: it calls a single GET endpoint, deserializes the response into a new model, and renders a table. No existing behavior is modified. The model, client method, and command handler all mirror the existing PhoneNumbers path closely, leaving little room for regression.

No files require special attention.

_{Reviews (3): Last reviewed commit: "fix: address review comments" | Re-trigger Greptile}

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📥 Commits

Reviewing files that changed from the base of the PR and between 61d1d1d and e23c24e.

📒 Files selected for processing (4)

• .gitignore
• src/client/mod.rs
• src/client/models/persona.rs
• src/commands/personas.rs

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_{Comment @coderabbitai help to get the list of available commands.}

[callumreid]

🟢

[borgesius]

Looks reasonable. This is a read-only voices command, and the response model matches the backend voices schema.