fix: use ~/.cora/ as config directory

[ajianaz]

Change

~/.config/cora/ → ~/.cora/

Brand awareness — one memorable dot folder for everything cora.

What changed

• cora_dir() helper centralizes path resolution
• API key stored at ~/.cora/config.toml (0600 perms)
• Auth messages updated to show ~/.cora/config.toml

Tested

• cora auth login → creates ~/.cora/config.toml
• cora auth status → reads from ~/.cora/config.toml
• Permissions verified: -rw-------

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a77c4482-d5f6-41a1-96af-b40fddc98eb3

📥 Commits

Reviewing files that changed from the base of the PR and between b7c9f43 and e71de9c.

📒 Files selected for processing (2)

• src/commands/auth.rs
• src/config/loader.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/use-dot-cora-dir

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