Add flash data

[skryukov]

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[Copilot]

Pull request overview

This pull request adds flash data functionality to InertiaRails, enabling one-time notifications that don't persist in browser history. Flash data is ideal for success messages, toast notifications, or other temporary values that should only appear once and not when users navigate through browser history.

Key changes:

• Introduces inertia_flash controller method for setting flash data via hash assignment syntax
• Adds support for passing flash data via redirect_to url, inertia: { flash: {...} }
• Flash data appears at page level (not in props) and is automatically cleared after rendering

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
spec/inertia/flash_sharing_spec.rb	Comprehensive test coverage for flash data including redirects, accumulation across multiple redirects, stale version handling, and partial updates
spec/dummy/config/routes.rb	Adds test routes for flash data controller actions
spec/dummy/app/controllers/inertia_test_controller.rb	Implements test controller actions demonstrating both flash data syntaxes and edge cases
lib/inertia_rails/renderer.rb	Retrieves flash data from controller and adds it to page response at root level
lib/inertia_rails/middleware.rb	Updates session cleanup logic to include flash data deletion and improves comment clarity
lib/inertia_rails/controller.rb	Adds inertia_flash method and capture_inertia_session_options logic to handle flash data with validation
docs/guide/shared-data.md	Replaces old flash messages section with reference to new flash data documentation
docs/guide/flash-data.md	Complete documentation for flash data feature with examples for all frameworks and TypeScript configuration
docs/guide/events.md	Documents the new flash event for handling flash data centrally
docs/.vitepress/config.mts	Adds flash data documentation to navigation menu

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[Copilot]

Pull request overview

Copilot reviewed 43 out of 46 changed files in this pull request and generated no new comments.

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