CAMEL-23598: TUI screenshot action (Shift+F5) to capture screen as ASCII art

[davsclaus]

Summary

• Adds a Shift+F5 keybinding to the Camel TUI monitor that captures the current screen as ASCII art (plain text) and saves it to the current directory
• Screenshot filename uses timestamp format: camel-tui-screenshot-20260521-094200.txt
• A green flash message confirms the save (or shows an error) for 3 seconds in the footer bar
• Uses TamboUI's ExportRequest.export(buffer).text().toFile(path) API

Test plan

• Compiles successfully
• Manual: run camel tui, press Shift+F5, verify .txt file is created with screen content
• Manual: verify flash message appears and disappears after 3 seconds

Claude Code on behalf of Claus Ibsen

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-core
• dsl/camel-jbang/camel-jbang-plugin-tui

⚠️ Some tests are disabled on GitHub Actions (@DisabledIfSystemProperty(named = "ci.env.name")) and require manual verification:

• dsl/camel-jbang/camel-jbang-core: 1 test(s) disabled on GitHub Actions

💡 Manual integration tests recommended:

You modified dsl/camel-jbang/camel-jbang-core. The related integration tests in dsl/camel-jbang/camel-jbang-it are excluded from CI. Consider running them manually:

mvn verify -f dsl/camel-jbang/camel-jbang-it -Djbang-it-test

All tested modules (6 modules)

• Camel :: JBang :: Core
• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container

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