fix: replace alert/confirm with inline toast and modal for profile ops

[Kirtan-pc]

Profile and backup operations in settings.js previously used native window.alert() and window.confirm() which surface as OS-level blocking modals. These are inconsistent with the dark-themed settings UI and block the Electron renderer thread.

Changes:

• Add showProfileStatus(elementId, message, isError, persistent) helper that renders a styled, auto-dismissing inline banner beneath each operation group (theme profiles, settings backup, aurora engine profiles), mirroring the existing showHotkeyStatus() pattern.
• Add showInlineConfirm(message) Promise-based helper that shows a dark-themed, non-blocking modal overlay instead of window.confirm(). Clicking outside or Cancel resolves false; clicking Confirm resolves true. Falls back to window.confirm() if DOM elements are absent.
• Add three .profile-status-msg elements in settings.html: #profile-status-msg (Theme Profiles section)
  #backup-status-msg (Settings Backup section)
  #aurora-status-msg (Aurora Engine Profiles section)
• Add #inline-confirm-modal overlay in settings.html.
• Add .profile-status-msg and .inline-confirm-overlay CSS in
  settings.css with slide-in animation and error/success colour coding.
• Replace every alert() / confirm() call in profile save, delete,
  duplicate, import, export, backup export/import, restore defaults,
  aurora engine profile save/load/delete, and gradient-stop limit
  with the new helpers.

Fixes Issue #279

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