Feature: Auto Zoom Reset option to Minimap module

[JuJuFX-dev]

What does this PR do?

Adds an optional Auto Zoom Reset to the Minimap module. When enabled, the minimap automatically zooms back out to maximum distance (zoom level 0) after a configurable number of seconds without a manual zoom change (scroll wheel or the +/- buttons).

Configured via a single "Reset Zoom" slider (0-15 seconds) placed next to the existing "Free Move Buttons" toggle in the minimap options. 0 (the default) disables the feature entirely, matching current behavior.

How was it tested?

Tested in-game on live retail: enabled the slider at various values (1-15s), zoomed in with the scroll wheel and with the +/- buttons, confirmed the map snaps back to max zoom-out after the configured delay and stays put while actively zooming. Confirmed the slider defaults to 0/disabled on a fresh profile and that existing zoom/scroll behavior is unchanged at 0.

Not tested on the 12.1 PTR client - the change touches only Minimap:GetZoom()/SetZoom(), which the module already calls elsewhere without an IS_121 split, so no divergence is expected, but flagging per the "both clients" criterion.

Screenshots

Not applicable - this is a single options-menu slider added next to an existing row, no layout/visual change beyond one new control.

Checklist

• New settings default OFF (no behavior change without opt-in) - zoomResetSeconds = 0 by default, which disables the reset path entirely.
• Zero cost while disabled: no events registered, no polling, no hooks doing work, no frames built - RestartZoomResetTimer() reads the setting and returns immediately without creating a timer when the value is 0.
• Cheap while enabled: event-driven (no polling, no timer-based logic, no per-frame allocations) - partially, flagging for review: the feature is inherently a "reset after N seconds of inactivity", so it uses a single-shot C_Timer.NewTimer, cancelled and re-armed only on the actual zoom-change events (scroll wheel, +/- button clicks) - not a per-frame or polling timer. This mirrors the existing debounce-timer pattern already used elsewhere in this file (e.g. the hover-reveal watcher and the free-move-button save). No OnUpdate, no polling loop.
• No writes onto Blizzard-owned frames (weak-table pattern used); HookScript/hooksecurefunc only, never SetScript on Blizzard frames - only calls the existing Minimap:GetZoom()/SetZoom() API methods (already used elsewhere in this file for scroll-to-zoom), and hooks the zoom buttons via the existing HookScript pattern.
• Tested in-game, works on live retail; no load errors on the 12.1 PTR client - live retail tested as above; PTR not tested, see note above.