Encapsulate util.cpp's own runtime state as static, not global

[netmindz]

Summary

Part of an ongoing pass identifying WLED_GLOBAL declarations that are actually only referenced in one file (see #5777-#5782 for earlier ones). 2 more turned out to be private to util.cpp: jsonBufferLock, jsonBufferLockMutex.

Converted both to file-local static, preserving the #if defined(ARDUINO_ARCH_ESP32) guard around jsonBufferLockMutex (it's a FreeRTOS semaphore, ESP32-only).

No behavior change — purely a storage-class change.

Test plan

• esp32dev: builds and links cleanly via pio run -e esp32dev — 1,320,319 bytes flash, no warnings.
• Confirmed via repo-wide grep (wled00/, usermods/) that neither converted variable is referenced outside util.cpp.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Refactor
  • Improved internal handling of JSON buffer locking on ESP32.
  • No user-facing behavior or functionality was changed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 3927e22e-a09f-4e17-94b0-6fe3b23acf69

📥 Commits

Reviewing files that changed from the base of the PR and between 0869ef4 and c9ce5c6.

📒 Files selected for processing (2)

• wled00/util.cpp
• wled00/wled.h

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Walkthrough

The change moves JSON buffer synchronization state into file-private storage in util.cpp. It removes the related global declarations from wled.h and preserves the existing JSON document declarations.

Changes

JSON buffer state encapsulation

Layer / File(s)	Summary
Encapsulate JSON buffer lock state wled00/util.cpp, wled00/wled.h	util.cpp adds file-private mutex and lock-owner state. wled.h removes their global declarations and retains the PSRAM-dependent pDoc and gDoc declarations.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• wled/WLED#5217: Both changes modify JSON buffer locking state and identifiers.
• wled/WLED#5777: Both changes move file-specific synchronization state out of wled.h.
• wled/WLED#5780: Both changes make JSON lock state file-local instead of globally declared.

Suggested labels: enhancement

Suggested reviewers: softhack007, dedehai

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: making util.cpp runtime state file-local static instead of global.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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