Add some new functionality

[BigIskander]

Add new functionality:

1. Ability to save history data (last 100 observations) to text file.
2. Ability to minimize the program to system tray.

[Copilot]

Pull request overview

Adds two user-facing features: exporting recent history values to a file and minimizing the Electron app to the system tray.

Changes:

• Add “Minimize to tray” menu entry and tray lifecycle logic in the Electron main process.
• Add “Save history” UI action to download history items as a local file.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 9 comments.

File	Description
src/electron.ts	Adds tray creation/destruction tied to window hide/show events.
src/MenuTemplate.ts	Adds an application menu item to hide the focused window (“Minimize to tray”).
app/src/components/Sidebar/HistoryDrawer.tsx	Adds client-side download/export of the history list via a generated data URL.

[BigIskander]

Applied changes suggested by code review.

[github-actions]

✅ Mobile Demo Video Generated Successfully

Full Mobile Video (Pixel 6 - 412x914)

📥 Download Mobile Video (MP4) | GIF

---

📑 Mobile Video Segments

Click to expand mobile segments

1. MQTT Explorer on Mobile (5.1s)

2. Connect to MQTT Broker (7.9s)

3. Browse Topic Tree (8.9s)

4. View Message Details (6.8s)

5. Search Topics (9.2s)

6. JSON Message Formatting (9.6s)

7. Settings with Disconnect/Logout (2.6s)

8. Mobile-Friendly MQTT Explorer (4.5s)

Mobile videos recorded at 412x914 (Pixel 6 viewport). Videos will expire in 90 days.

[github-actions]

✅ Mobile Demo Video Generated Successfully

Full Mobile Video (Pixel 6 - 412x914)

📥 Download Mobile Video (MP4) | GIF

---

📑 Mobile Video Segments

Click to expand mobile segments

1. MQTT Explorer on Mobile (5.1s)

2. Connect to MQTT Broker (8.0s)

3. Browse Topic Tree (9.0s)

4. View Message Details (6.8s)

5. Search Topics (9.2s)

6. JSON Message Formatting (9.6s)

7. Settings with Disconnect/Logout (2.6s)

8. Mobile-Friendly MQTT Explorer (4.5s)

Mobile videos recorded at 412x914 (Pixel 6 viewport). Videos will expire in 90 days.

[github-actions]

⚠️ Mobile Demo Video Generated (Test Failed)

⚠️ Note: The mobile demo test encountered errors but videos were still uploaded for debugging. Check the logs for details.

Full Mobile Video (Pixel 6 - 412x914)

📥 Download Mobile Video (MP4) | GIF

---

Scene information not available - check if video processing completed

Mobile videos recorded at 412x914 (Pixel 6 viewport). Videos will expire in 90 days.

[github-actions]

✅ Mobile Demo Video Generated Successfully

Full Mobile Video (Pixel 6 - 412x914)

📥 Download Mobile Video (MP4) | GIF

---

📑 Mobile Video Segments

Click to expand mobile segments

1. MQTT Explorer on Mobile (5.1s)

2. Connect to MQTT Broker (8.0s)

3. Browse Topic Tree (9.0s)

4. View Message Details (6.8s)

5. Search Topics (9.2s)

6. JSON Message Formatting (9.6s)

7. Settings with Disconnect/Logout (2.6s)

8. Mobile-Friendly MQTT Explorer (4.5s)

Mobile videos recorded at 412x914 (Pixel 6 viewport). Videos will expire in 90 days.

[github-actions]

✅ Mobile Demo Video Generated Successfully

Full Mobile Video (Pixel 6 - 412x914)

📥 Download Mobile Video (MP4) | GIF

---

📑 Mobile Video Segments

Click to expand mobile segments

1. MQTT Explorer on Mobile (5.1s)

2. Connect to MQTT Broker (8.1s)

3. Browse Topic Tree (9.0s)

4. View Message Details (6.8s)

5. Search Topics (9.3s)

6. JSON Message Formatting (9.6s)

7. Settings with Disconnect/Logout (2.6s)

8. Mobile-Friendly MQTT Explorer (4.5s)

Mobile videos recorded at 412x914 (Pixel 6 viewport). Videos will expire in 90 days.

[github-actions]

✅ Mobile Demo Video Generated Successfully

Full Mobile Video (Pixel 6 - 412x914)

📥 Download Mobile Video (MP4) | GIF

---

📑 Mobile Video Segments

Click to expand mobile segments

1. MQTT Explorer on Mobile (5.1s)

2. Connect to MQTT Broker (8.1s)

3. Browse Topic Tree (9.0s)

4. View Message Details (6.8s)

5. Search Topics (9.3s)

6. JSON Message Formatting (9.6s)

7. Settings with Disconnect/Logout (2.6s)

8. Mobile-Friendly MQTT Explorer (4.5s)

Mobile videos recorded at 412x914 (Pixel 6 viewport). Videos will expire in 90 days.