fix(tv): scale option-modal cards with text size + honor cardWidth

The TV option modal hardcoded the card size to scaleSize(160)/(75),
ignoring the caller's cardWidth/cardHeight and never growing with the
user's text-scale setting. With "Large" text, long values (e.g. a
root-folder path) overflowed the fixed card and were truncated. Honor
the provided cardWidth/cardHeight and multiply by the text scale
(new useTVRelativeScale) so the card grows in step with the font.

Claude-Session: https://claude.ai/code/session_016Hhu5DruGLPhdP4LAoy1Xd

constants/TVTypography.ts

@@ -55,6 +55,20 @@ export type ScaledTVTypography = {
   callout: number;
 };
 
+/**
+ * Returns the user's text-scale factor relative to the Default scale (1.0 at
+ * Default, >1 for Large/ExtraLarge, <1 for Small). Use it to scale containers
+ * (e.g. option-card width/height) in step with the scaled font so larger text
+ * settings don't overflow fixed boxes.
+ */
+export const useTVRelativeScale = (): number => {
+  const { settings } = useSettings();
+  const scale =
+    scaleMultipliers[settings.tvTypographyScale] ??
+    scaleMultipliers[TVTypographyScale.Default];
+  return scale / scaleMultipliers[TVTypographyScale.Default];
+};
+
 /**
  * Hook that returns scaled TV typography values based on user settings.
  * Use this instead of the static TVTypography constant for dynamic scaling.