Encapsulate ntp.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-#5780 for earlier ones). 3 more turned out to be private to ntp.cpp: lastTimerMinute, ntpPacketSentTime, ntpServerIP.

Converted all 3 to file-local static, same types and initial values as before.

No behavior change — purely a storage-class change.

Test plan

• esp32dev: builds and links cleanly via pio run -e esp32dev — 1,320,323 bytes flash, no warnings.
• Confirmed via repo-wide grep (wled00/, usermods/) that none of the 3 converted variables are referenced outside ntp.cpp.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Refactor
  • Improved internal handling of network time synchronization state.
  • No user-facing behavior or functionality changes.

[coderabbitai]

Walkthrough

The change moves three NTP runtime variables from shared wled.h declarations to file-local static storage in ntp.cpp.

Changes

NTP state encapsulation

Layer / File(s)	Summary
Localize NTP runtime state wled00/ntp.cpp, wled00/wled.h	lastTimerMinute, ntpPacketSentTime, and ntpServerIP are defined as file-local static variables in ntp.cpp. Their shared declarations are removed from wled.h.

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

Possibly related PRs

• wled/WLED#5777: Applies similar file-local state encapsulation to hue.cpp.
• wled/WLED#5778: Applies similar encapsulation to variables in wled.cpp and ntp.cpp.
• wled/WLED#5779: Applies similar encapsulation to file-specific runtime state.

Suggested reviewers: dedehai, softhack007

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: making ntp.cpp runtime state file-local static instead of global.

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