fix: support unicode grapheme cluster rendering for complex scripts #85
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- Add two-pass rendering in renderLine (backgrounds first, then text) to fix left-extending Devanagari diacritics like ि that extend into the previous cell's visual area - Add adjacent row redraw when a row is dirty to handle tall glyphs that extend beyond cell boundaries (fixes artifacts when clearing lines with Devanagari text) - Add grapheme cluster support via WASM API: - ghostty_render_state_get_grapheme() for viewport cells - ghostty_terminal_get_scrollback_grapheme() for scrollback - grapheme_len field in GhosttyCell struct - Enable mode 2027 (grapheme clustering) by default - Update selection-manager to extract full graphemes for copy/paste - Add tests for grapheme cluster support
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