Improve Indoor Positioning Accuracy on PDF Map Overlay

[devridge0]

The current map overlay relies on matching anchor pixel coordinates from PDF maps to geolocations via appData.json. However, misalignment between the user’s "blue dot" and the PDF overlay sometimes occurs, degrading navigation accuracy. Consider refining the coordinate mapping or adding dynamic calibration fallback.
Sample:

// Example: refine mapping logic in MapOverlayManager.swift
let offset = calculateOffset(anchorPixel: anchor_pixel, geo: anchor_location)
pdfOverlay.adjustPosition(by: offset)