feat: creator token is live dialog

[ice-damocles]

Description

• Display "Creator token is live" dialog when someone buy user token for the first time
• Subscribes to 31175 in Global Subscription

Task ID

ION-4905, ION-5027

Type of Change

• New feature

[Copilot]

Pull request overview

This PR adds a "Creator token is live" dialog feature that displays when someone buys a user's token for the first time. The implementation subscribes to Nostr event kind 31175 (CommunityTokenDefinitionEntity) globally and shows a celebration dialog to the token creator when the first purchase occurs.

Key Changes:

• Added localization strings for the new dialog across 11 languages
• Implemented a new dialog component with gradient styling and share functionality
• Created an event handler to detect first-buy events and trigger the dialog
• Extended GradientBorderPainter to support background colors

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
lib/l10n/app_*.arb	Added localized title and subtitle strings for the creator token live dialog
lib/app/features/tokenized_communities/views/creator_token_is_live_dialog.dart	New dialog component displaying creator token live notification with share functionality
lib/app/features/tokenized_communities/providers/community_token_definition_handler.r.dart	Event handler that detects first-buy events and triggers the dialog via UI event queue
lib/app/features/ion_connect/providers/global_subscription.r.dart	Registered kind 31175 (CommunityTokenDefinitionEntity) in global subscription
lib/app/features/ion_connect/providers/events_management_service.r.dart	Registered the community token definition handler in the events management service
lib/app/components/gradient_border_painter/gradient_border_painter.dart	Extended painter to optionally render background color behind gradient border

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