Encapsulate rolloverMillis with a read-only accessor

[netmindz]

Summary

Part of an ongoing pass on WLED_GLOBAL declarations (see #5777-#5789, #5774/#12 for earlier ones). rolloverMillis (a millis()-rollover counter, incremented in wled.cpp's main loop) is read-only from json.cpp and one usermod.

Moved it to file-local static in wled.cpp and exposed a by-value getter, getRolloverMillis(), rather than a mutable reference — same reasoning as #5789: since nothing outside wled.cpp writes it, the by-value getter makes an accidental external write a build error instead of a silent bug.

Also fixed the one external consumer this surfaced: usermods/quinled-an-penta read rolloverMillis directly for its own uptime string (same idiom as json.cpp — its own comment says "From json.cpp"). Updated to use the new accessor.

No behavior change — purely a storage/access-pattern change.

Test plan

• esp32dev: builds and links cleanly via pio run -e esp32dev.
• usermods env (builds all 59 usermods, including the fixed quinled-an-penta): builds and links cleanly via pio run -e usermods.
• Repo-wide grep confirms no remaining raw references to rolloverMillis outside wled.cpp.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 0869ef4 and 15dabfa.

📒 Files selected for processing (5)

• usermods/quinled-an-penta/quinled-an-penta.cpp
• wled00/fcn_declare.h
• wled00/json.cpp
• wled00/wled.cpp
• wled00/wled.h

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