Add on-map controls and in-app downloads panel; improve navigation, motion handling and weather caching

[Capybla]

Motivation

• Provide quick, on-map controls for centering, toggling the sidebar and starting/stopping navigation to improve UX while flying.
• Allow users to download terrain and airspace datasets in-app for offline use.
• Improve sensor/motion update performance and persist a minimized weather snapshot for offline fallback.

Description

• Added styles in frontend/src/App.css for .map-button-controls, .downloads-panel and related download UI elements.
• Introduced MAP_DATASETS and a new DownloadsPanel component in frontend/src/App.js that simulates download progress and supports start/pause/reset actions, and included it in the sidebar UI.
• Added MapButtonControls component and wired it into the map widget with handlers for onCenterPosition, onToggleSidebar, onStartNavigation and onEndNavigation and conditional enablement based on GPS and selected route.
• Extended motionData state to include barometric fields, throttled motion updates via requestAnimationFrame, and added handleCenterPosition to center the map on the current GPS position.
• Enhanced weather fetch logic to save a minimized snapshot to localStorage on success and to use cached data when offline, and adjusted useEffect dependencies and cleanup accordingly.
• Removed an obsolete standalone MapContainer block and integrated map controls into the draggable map widget.

Testing

• Ran the project build with npm run build, which completed successfully.
• Executed the test suite with npm test; the test run completed without failures (no new unit tests were added).
• Verified the development server with npm start to ensure the new controls and downloads panel render and basic interactions work (automated build/dev commands only).

---

Codex Task

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: d25805130f

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Remove self-updating weather snapshot dependency

Including lastWeatherSnapshot in this effect’s dependency list causes a request loop whenever a position is available and the app is online: the effect fetches weather, then calls setLastWeatherSnapshot(...) with a new object (updatedAt: Date.now()), which retriggers the same effect immediately and repeats indefinitely. In practice this will spam /conditions, increase battery/network usage, and can make the UI feel unstable under normal online navigation.

Useful? React with 👍 / 👎.