Add SdCardFontFamilyInfo::pickClosestSize(targetPtSize) and have the
manager and SdCardFontSystem drive size selection from a target point
size derived from the user's font-size enum (SMALL=12, MEDIUM=14,
LARGE=16, EXTRA_LARGE=18) rather than indexing the family's sorted size
list by enum ordinal.
The ordinal-slot approach mis-selects whenever a family doesn't ship the
canonical {12,14,16,18} set: a family with only [10,14,18] would map
SMALL/MEDIUM/LARGE/EXTRA_LARGE to 10/14/18/18 — fine for SMALL but
arbitrary for the rest. Closest-pt always picks the on-disk file nearest
to the user-intended point size, with a deterministic smaller-pt
tie-break.
No change for canonical-sized families.
## Summary
* **What is the goal of this PR?** (e.g., Implements the new feature for
file uploading.)
* **What changes are included?**
## Additional Context
* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
specific areas to focus on).
---
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