Fix bitmap palette resolution and XMED style parsing

[matthewdean]

Summary

• Fix bitmap palette resolution to use clut_cast_lib from BitmapInfo metadata instead of always using the bitmap's own cast library. This fixes cross-cast-lib palette references.
• Update all PaletteRef::from call sites to match the new 3-arg signature (palette_id, clut_cast_lib, bitmap_cast_lib)
• Fix XMED styled text parser to parse all available styles rather than capping at the declared style count, which could be inaccurate

Notes

Pure bug fixes — no new features or behavioral changes. Part 2 of a series splitting the bionicle-atticmedia branch into reviewable PRs.

Test plan

• Builds with wasm-pack build --dev --target web
• Verify bitmaps with cross-cast-lib palettes render correctly
• Verify styled text fields display all styles

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