Fix Server sketch compilation: add forward declaration for purgePendingConfigNotes

[Copilot]

handleConfigCancelPost calls purgePendingConfigNotes at line ~6850, but the function is defined at line ~7295 with no prior forward declaration, causing the Arduino preprocessor to fail with "not declared in this scope".

Change

Added one forward declaration to the existing declarations block alongside dispatchPendingConfigs:

// Before (line 1721):
static void dispatchPendingConfigs();

// After:
static uint8_t purgePendingConfigNotes(const char *clientUid);
static void dispatchPendingConfigs();

Original prompt

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This section details on the original issue you should resolve

<issue_title>Arduino Compilation Error in TankAlarm-112025-Server-BluesOpta (2026-02-28)</issue_title>
<issue_description>## Arduino Compilation Failed - TankAlarm 112025

The Arduino code compilation failed for the TankAlarm-112025 (Blues Opta) projects.

Workflow Run: https://github.com/SenaxInc/ArduinoSMSTankAlarm/actions/runs/22531031477
Commit: ca16cde
Branch: master

Details

TankAlarm-112025 (Arduino Opta)

• Client Sketch: TankAlarm-112025-Client-BluesOpta/TankAlarm-112025-Client-BluesOpta.ino ✅
• Server Sketch: TankAlarm-112025-Server-BluesOpta/TankAlarm-112025-Server-BluesOpta.ino ❌
• Viewer Sketch: TankAlarm-112025-Viewer-BluesOpta/TankAlarm-112025-Viewer-BluesOpta.ino ✅

Board:

• Arduino Opta (arduino:mbed_opta:opta)

Triggered by: push

Next Steps

1. Review the workflow logs for detailed error messages
2. Fix compilation errors in the Arduino code
3. Re-run the workflow to verify the fix

/cc @copilot</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Arduino Compilation Error in TankAlarm-112025-Server-BluesOpta (2026-02-28) #265

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[Copilot]

Pull request overview

Fixes an Arduino compilation failure in the Server sketch by adding a missing forward declaration so handleConfigCancelPost() can call purgePendingConfigNotes() before its definition.

Changes:

• Added static uint8_t purgePendingConfigNotes(const char *clientUid); to the existing forward-declarations block in the Server sketch.

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