fix(android): don't copy cached typeface when cloning a Font

[farfromrefug]

Problem

FontBase.cloneOrDirty() clones with Object.assign(clone, this), which also copies the Android cached _typeface set by Font.getAndroidTypeface(). Only the non-clone (dirty) branch cleared it.

So withFontWeight / withFontFamily / withFontStyle / withFontSize / withFontScale / withFontVariationSettings returned a clone with the new property but the old cached typeface, and getAndroidTypeface() kept returning it (it only recreates when !this._typeface).

Seen in oss-weather: @nativescript-community/ui-canvas Paint.setFontWeight() calls font.withFontWeight(weight). Once the paint had drawn, weight changes were ignored (bold text rendered regular).

Fix

Reset _typeface on the returned font in both branches, so clones rebuild their typeface from their own properties.

iOS needs no change: Font there has no per-instance cache; getUIFont() goes through the global uiFontCache keyed by the font descriptor.

Tests

Added packages/core/ui/styling/font.spec.ts:

• every with* clone has a null _typeface; source font keeps its own
• clone keeps descriptor fields and applies the new property
• non-clone path (forceClone = false) still marks dirty and clears _typeface

The first test fails without the fix (expected { cached: true } to be null).

Note: run locally with vitest and a temporary config (same test settings and ~ alias) because @nx/vite isn't installed in that checkout; the standard nx test config was not run.

Follow-up

Once released, oss-weather can drop app/helpers/fontClone.ts and the fixFontCloneTypeface() call in app/main.ts.

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