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perf: optimize viewport to skip redundant refreshes (#300)

* perf: optimize viewport to skip redundant refreshes

Introduces a `_dirty` flag and an optional `force` parameter to the
`viewport.refresh` method. This ensures that the underlying device's
`display` method is only invoked when content has actually changed,
reducing unnecessary I/O and CPU usage.

Changes include:
- Tracking a `_dirty` state when hotspots are removed.
- Adding a `force` flag to `refresh()` to allow explicit overrides.
- Updating `display()` and `set_position()` to trigger a forced
  refresh.
- Skipping the `device.display()` call if no redraw is required and no
  state changes are detected.

```mermaid
sequenceDiagram
    participant App
    participant Viewport
    participant Hotspot
    participant Device

    App->>Viewport: refresh(force)
    Viewport->>Hotspot: should_redraw()
    Hotspot-->>Viewport: redraw_needed

    alt force or redraw_needed or dirty
        Viewport->>Device: display(image)
        Note over Viewport: Set dirty = False
    else no changes
        Note over Viewport: Skip display update
    end
```

Fixes #280

* fscking whitespace

* chore: enable colored output in CI logs

Set environment variables to force colored output for tools and disable
the interactive `tox` spinner. This improves the readability and
cleanliness of the GitHub Actions logs.

* Revert "chore: enable colored output in CI logs"

This reverts commit f2d5e4c2d.

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