CAMEL-23572: camel-tui: Add F2 actions menu with example browser

[davsclaus]

Summary

• Adds an F2 actions menu to the TUI overview tab with a "Run an example..." action
• Example browser popup shows all 21 curated examples grouped by level (beginner/intermediate/advanced)
• Each example shows bundled/online and Docker icons (📦/🌐/🐳) with a legend
• Long descriptions word-wrap without splitting words
• Selecting an example launches it asynchronously via camel run --example=<name>
• Status notifications appear in the header (green on success, red on failure)
• Supports Up/Down, Page Up/Down navigation and auto-scrolling

Test plan

• Press F2 on overview tab → actions menu appears centered
• Select "Run an example..." → example browser shows 21 examples grouped by level
• Verify emojis and legend display correctly
• Navigate with Up/Down and Page Up/Down → cursor skips separator lines
• Select a bundled example (e.g., timer-log) → popup closes, process starts, notification shows
• Verify launched integration appears in overview after a few seconds
• Esc from browser → back to actions menu; Esc from actions → closes
• Footer hints update correctly for each popup state

Claude Code on behalf of Claus Ibsen

🤖 Generated with Claude Code

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

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

All tested modules (2 modules)

• Camel :: JBang :: Plugin :: TUI
• Camel :: Launcher :: Container

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