QoL: Shows durability % on QoL Extras

[xatzisktv]

Summary

Adds an optional durability readout to the FPS counter so you can see your lowest equipped-item durability % alongside FPS, world MS, and local MS.

• Extends the FPS counter with a new 87% (dur) segment that follows the same divider + value + label styling as the existing MS readouts
• Adds a Show Durability on FPS Counter toggle in the QoL EXTRAS section (disabled when the FPS counter is off)
• Extracts shared GetLowestEquippedDurability() logic used by both the FPS display and the existing Low Durability Warning, so both always report the same value
• Fixes missing _lblWorld / _lblLocal references so FPS label font sizing applies correctly

Saved variable: EllesmereUIDB.fpsShowDurability (defaults to off)

Test plan

• Enable Show FPS Counter and confirm FPS (and optional world/local MS) still display correctly
• Enable Show Durability on FPS Counter and confirm NN% (dur) appears after the MS segments
• Damage gear or repair and confirm the % updates within ~1s
• Confirm the displayed % matches the value used by Low Durability Warning
• Toggle durability off — segment disappears, FPS counter remains
• Disable the FPS counter — durability segment is hidden and the durability toggle is dimmed with the "requires Show FPS Counter" tooltip
• Toggle world/local MS independently — durability always anchors after the last visible segment
• Confirm the FPS counter unlock/position entry still works with the wider frame