feat: add Claude CLI profile management

[ansonlotiniat]

Summary

• Add isolated Claude CLI profile management using CLAUDE_CONFIG_DIR.
• Support official claude auth login flows and ANTHROPIC_BASE_URL / ANTHROPIC_AUTH_TOKEN env-token launch mode.
• Wire Claude into navigation, dashboard, floating card, settings order, account transfer, and data transfer.
• Add terminal execution support including Terminal, iTerm2, and Ghostty.

Testing

• npm run typecheck
• rustfmt --check src-tauri/src/models/claude.rs src-tauri/src/modules/claude_account.rs src-tauri/src/commands/claude.rs
• cargo check --manifest-path src-tauri/Cargo.toml
• cargo test --manifest-path src-tauri/Cargo.toml auth_token_mode --lib
• cargo test --manifest-path src-tauri/Cargo.toml macos_search_dirs_include_bun_bin_under_home --lib

Privacy

• Scanned the diff for private endpoint, token, email, and local user path patterns; no personal AI account information is included.