Filament User Sessions Laravel Package

Release body:

Added

• New device detection — sessions are flagged (⚠️) in the Sessions
  table when their browser/platform combination was first seen for that
  user within the last 24 hours (configurable via new_device_window_hours).
  Backed by a new session_known_devices table that persists across
  logout, unlike the sessions table itself.
• New device notifications — the first time (and only the first time)
  a device is seen for a user, configured recipients are notified via
  Smony\FilamentUserSessions\Notifications\NewDeviceLogin. The package
  doesn't know who your admins/security team are, so this is opt-in:
  implement Smony\FilamentUserSessions\Contracts\ResolvesNewDeviceRecipients
  and point new_device_notification_recipients at it. Disabled (no-op)
  until configured.

Requires

```bash
php artisan migrate
```
to create the new session_known_devices table.

No breaking changes — existing installs behave identically until you
opt into the new config.

Added

• Smony\FilamentUserSessions\Policies\SessionPolicy — a default,
  fully-permissive policy for the Session model.
• Revoke actions (single + bulk) and the "Online now" widget now
  respect Laravel policy authorization (viewAny, view, delete,
  deleteAny).

Host apps can now restrict who can view or revoke sessions by
registering their own policy:

```php
Gate::policy(Session::class, YourSessionPolicy::class);
```

Default behavior is unchanged — if you don't register your own
policy, nothing changes for you.

No breaking changes.

"Added:

• Support for Filament v5 (constraint widened to `^4.0|^5.0`) — no breaking changes, resolves #1, #2

Fixed:

• Bulk "Revoke selected" action no longer force-logs-out your own current session — it's now excluded from the batch, matching the behavior of the single revoke action.

Full Changelog: https://github.com/Smony/filament-user-sessions/compare/v2.0.1...v2.0.2

Fixed

• Fatal error on Filament v4: $navigationIcon/$navigationGroup now use
  the correct BackedEnum/UnitEnum union types required by
  Filament\Resources\Resource.

Initial release: session list with device/browser detection, revoke action, bulk revoke, online-now widget