fix(android): clamp text decoration offsets to truncated layout

[lazerg]

Summary:

On Android, a Text with numberOfLines can crash when a nested Text has textDecorationLine: 'underline' or 'line-through' and the decorated span starts or ends past what the truncated layout actually rendered. drawSpannedDecoration() reads start/end from the full, untruncated Spanned text and passes them straight to Layout.getPrimaryHorizontal(), which throws IndexOutOfBoundsException once numberOfLines cuts the layout shorter than the span.

This clamps both offsets to the last position the truncated (and possibly tail-ellipsized) layout can actually resolve before using them, so a partially hidden span draws its decoration up to the visible boundary and a fully hidden span draws nothing, instead of crashing.

Changelog:

[ANDROID] [FIXED] - Fix crash drawing text decoration (underline/strikethrough) when a nested Text's span extends past a numberOfLines-truncated layout

Test Plan:

Added two regression tests in TextDecorationStyleTest: both build a single-line, tail-ellipsized StaticLayout and confirm they throw IndexOutOfBoundsException against the pre-fix code. With the fix, one asserts the decoration line is drawn clamped to the visible boundary for a span that starts visible and runs past it, and the other asserts a span that starts entirely past the visible boundary draws a zero-length (invisible) line instead of crashing.

Fixes #58356