feat: implement interactive TUI dashboard with ratatui

[dev-dami]

Summary

Replaces the empty TUI placeholder with a full interactive dashboard built on ratatui and crossterm.

• App struct manages engine, config, snapshot state, and tab selection
• Event loop runs at the configured refresh rate with non-blocking input polling
• Header bar shows module names as colored tabs, selected tab is bolded and underlined
• Each module gets its own panel with a gauge bar for percentage metrics and a sorted key-value detail list
• Footer shows keybinding hints (configurable via show_help)
• All colors, borders, and labels come from gim_config.yaml theme settings
• Keyboard navigation: q/Esc quit, Tab/arrows/h/l switch modules

Commits

1. feat(tui): add App struct, event loop, and keyboard navigation
2. feat(tui): implement header tabs and footer help bar
3. feat(tui): add module panels with gauge bars and metric details

Summary by CodeRabbit

• New Features
  • Added a complete terminal user interface for the application
  • Added tabbed navigation to view different modules
  • Added keyboard controls for navigation (arrow keys, tab) and application control
  • Added periodic metrics refresh with data visualization using gauges and formatted displays

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[dev-dami]

Looking good. Event loop handles KeyEventKind::Press correctly for Windows compat. Gauge bar only renders for modules with a percentage metric — right behavior. Theme integration via module_theme() is clean and will scale when new modules land. Terminal cleanup path is correct. One thing to note: the 200ms CPU sleep in CpuCollector will add latency to the first TUI refresh, but that's a collector-layer concern not a TUI one.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

A complete terminal user interface (TUI) implementation has been added to src/tui/mod.rs. This introduces a public App struct for managing UI state, a run_tui() entry function that manages the main event loop, and numerous private rendering and formatting helpers. The implementation uses Crossterm and Ratatui to handle event polling, layout management, widget composition, and state-driven updates with tabbed module navigation.

Changes

Cohort / File(s)	Summary
Terminal UI Implementation src/tui/mod.rs	Complete TUI system with public App struct and run_tui() function. Includes event loop with input handling (navigation, quit), state refresh from engine, rendering pipeline for header/modules/footer, data formatting utilities (metrics, gauges, byte display), and color theming logic.

Sequence Diagram

sequenceDiagram
    participant User
    participant App
    participant Engine
    participant Terminal
    
    User->>App: Start TUI (run_tui)
    App->>App: Initialize App state
    loop Event Loop
        User->>Terminal: Input events (tab, arrows, quit)
        Terminal->>App: Poll events
        alt Tab/Arrow Navigation
            App->>App: Update active tab/focus
        else Refresh Tick
            App->>Engine: Fetch current metrics/data
            Engine-->>App: Return data
            App->>App: Update App state (refresh)
        else Quit
            App->>Terminal: Cleanup & restore terminal
            Terminal-->>User: Exit TUI
        end
        App->>Terminal: Render layout (header/modules/footer)
        Terminal->>Terminal: Compose widgets (blocks, gauges, text)
        Terminal-->>User: Display frame
    end

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Poem

🐰 A terminal so fine, with widgets all aligned,
Tab keys dance, and colors brightly signed,
Through Ratatui's art, our UI came alive,
With gauges, blocks, and metrics all to thrive!

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/tui-dashboard

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