Add login URL copy action

[hallerite]

Summary

• add a configurable app.clipboard.copyLoginUrl action, defaulting to c
• copy the raw OAuth sign-in URL through the existing SSH-aware clipboard utility
• show copy success or failure in the login dialog
• document the binding and add regression coverage for default and customized shortcuts

Root cause

Login dialogs rendered long authorization URLs through the wrapping Text component. On headless or SSH hosts, selecting the displayed URL could include line breaks and padding, leaving users without a reliable way to open it locally.

Validation

• npx tsx ../../node_modules/vitest/dist/cli.js --run test/login-dialog.test.ts (14 tests passed)
• npm run check

Fixes #643

Note

Add copy-to-clipboard action for sign-in URLs in the login dialog

• Adds a new app.clipboard.copyLoginUrl keybinding (defaults: c, alt+c) that copies the raw sign-in URL from the login dialog to the clipboard.
• The dialog displays a copy hint alongside the cancel hint; on success or failure it shows 'Copied sign-in link' or 'Failed to copy sign-in link'.
• Printable key presses bound to this action are ignored when the manual input field is visible to avoid disrupting text entry.

^{Macroscope summarized 4700445.}

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Note

Low Risk
UI and clipboard-only changes in the login flow; no auth, daemon, or data-handling logic changes.

Overview
Adds app.clipboard.copyLoginUrl (default c / alt+c) so browser sign-in flows can copy the raw OAuth URL via the existing clipboard helper instead of selecting wrapped terminal text.

The login dialog shows a copy hint next to cancel, updates to Copied sign-in link or Failed to copy sign-in link, and ignores the copy binding for printable keys while the manual paste field is visible so c still types normally. Keybindings docs, changelog, and login-dialog.test.ts cover default and customized shortcuts.

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