ddidderr
7b408257c4
Completes the font engine port: - shaper/run.rs ports run.zig: the RunIterator over terminal rows that splits text runs at style/face boundaries, selection and cursor, handles graphemes and ligatures; Shaper::shape_run shapes a run. - shared_grid_set.rs ports SharedGridSet.zig: grids keyed by a config derived key, handed out as Arc<SharedGrid>. - Font-related types now have one canonical definition in ghostty-config (Variation, Descriptor, CodepointMap, metric modifiers, freetype load flags, synthetic style, shaping break) which the font crate re-exports. MetricModifier::apply_i32 now saturates to -i32::MAX like Zig. - The 23 terminal-driven harfbuzz shaper tests are ported, printing via Screen until Terminal lands. Test Plan: - cargo test -p ghostty-font (157 passed, 3 ignored - also skipped in Zig); Devanagari/Chakma/Bengali tests return early without system fonts - cargo test -p ghostty-config (255 passed)