Acknowledge added SSIDs before returning to the menu

[p-keminer]

Summary

• show a persistent success acknowledgement after adding an SSID
• return to WiFi General instead of reopening an empty input form
• use a non-touch Returning... message where tap instructions are unavailable

Testing

• Focused touch-hardware test: one SSID was added exactly once; the success screen remained until a fresh tap, returned without a bright intermediate frame, and cancel or empty input added nothing.
• The non-touch return path was code/build covered, not separately exercised on hardware.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.40%. Comparing base (66f3c81) to head (eddbe17).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
esp32_marauder/MenuFunctions.cpp	0.00%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #1430      +/-   ##
==========================================
- Coverage     0.40%   0.40%   -0.01%     
==========================================
  Files           20      20              
  Lines        17176   17202      +26     
  Branches        11      11              
==========================================
  Hits            69      69              
- Misses       17103   17129      +26     
  Partials         4       4              

Flag	Coverage Δ
firmware-unit-tests	0.40% <0.00%> (-0.01%)	⬇️

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[Copilot]

Pull request overview

This PR improves the “Add SSID” flow in the WiFi General menu by showing a clear success acknowledgement after an SSID is added, then returning the user to WiFi General instead of looping back into an empty SSID input prompt. It also adds a non-touch fallback message (“Returning...”) for builds where tap instructions aren’t applicable.

Changes:

• Add an ILI9341-only acknowledgement screen (SSID added) with touch-to-continue behavior (or timed return for non-touch builds).
• Stop the SSID input loop after a successful add, preventing the empty form from immediately reopening.
• Return to wifiGeneralMenu explicitly after the add/cancel flow.

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[p-keminer]

All 22 firmware matrix builds and the Native Unity tests pass on this head. The remaining red statuses are limited to the repository-wide Codecov policy addressed separately in #1448.