fix(fonts): update text-shaper to 0.1.28

[wiedymi]

Summary

• update the runtime dependency from text-shaper 0.1.27 to 0.1.28
• prepare and lock restty 0.2.6
• compose Apple Color Emoji flags, keycaps, ZWJ families, rainbow flags, and skin-tone sequences as single glyphs
• preserve VS16 behavior from text-shaper 0.1.27

Root cause

Apple Color Emoji implements complex emoji sequences as AAT morx ligatures. Text-shaper's class lookup, ligature-table parsing, and state-machine action processing were incomplete, so the sequences remained separate component glyphs and could not enter restty's single-glyph color atlas path.

Text-shaper 0.1.28 implements the missing lookup and ligature data, follows Apple/HarfBuzz action semantics, treats zero substitutions as no-ops, bounds binary-table regions, rejects invalid component indices, and avoids duplicate component pushes across DontAdvance transitions.

Validation

• exact installed dependency: text-shaper@0.1.28
• 6 cross-platform upstream morx regressions passed
• 316 restty CI-safe tests passed
• bun install --frozen-lockfile
• bun run check:themes
• bun run format:check
• bun run lint
• bun run build:types
• bun run build
• bun run playground:build
• release-note extraction for 0.2.6

Upstream: wiedymi/text-shaper#6
Follow-up to #30

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