Add whoami command using GET /v3/me

[salmanfarisvp]

Summary

• Adds a top-level screenly whoami command that calls GET /v3/me in a single request
• Displays user email, name, IDs, and workspace details in table, JSON, and CSV output formats
• Updates CLI help docs and adds unit tests with non-personal fixtures

Local build test

• Values are redacted

> screenly whoami   

+---------------+-----------------------------+
| Field         | Value                       |
+---------------+-----------------------------+
| Email         | name@screenly.io            |
+---------------+-----------------------------+
| Name          | Salman Faris                |
+---------------+-----------------------------+
| User ID       | xxxxxxxxxxxxxxxxxxxxxxxxxxx |
+---------------+-----------------------------+
| Workspace     | CSS                         |
+---------------+-----------------------------+
| Workspace ID  | xxxxxxxxxxxxxxxxxxxxxxxxxxx |
+---------------+-----------------------------+
| Workspace URL |https://salman.screenlyapp.com|
+---------------+-----------------------------+

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[sergey-borovkov]

A few small things inline, nothing blocking.

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved blocking issues were identified.

Review effort: Lite
Findings: None

[Copilot]

Copilot review overview

🔵 Needs a closer look

Keep API error output off stdout for JSON and CSV modes.

Review effort: Lite
Findings: None

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved blocking issues were identified.

Review effort: Lite
Findings: None

[sergey-borovkov]

All three comments addressed, plus the stdout fix in commands::get. Checked out the branch: 222 tests pass, clippy and cargo fmt --check are clean, and with a bad token stdout is now empty so -o json stays parseable.