Add a preset-size dropdown (10/12/14/18/24pt, plus Default to clear) to the
compose FormattingToolbar via a new FontSizePicker composable, applying
RichStyle.FontSize over the selection through the existing generalized
applyStyle/clearStyle toggle path (no font-size-specific branching needed).
The anchor button shows the selection's current size, or "Default" when
unset/mixed. The rich-text foundation already provided RichStyle.FontSize,
its pt/px-tolerant HTML round-trip, and pt->sp mapping for in-editor
rendering; this ticket wires up the missing UI control.
Closes#73
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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