cottongin 1105919359 fix: BookInfo performance — Y-culling, newline normalization, cover clamping ...

Addressed critical render performance issues identified via device debug log:
- Add Y-culling in render() to skip off-screen draw calls (was causing
  337K LOG_ERR calls per frame, 7-13s render times)
- Normalize description whitespace (strip embedded \n/\r/\t) to prevent
  "No glyph for codepoint 10" errors
- Clamp cover bitmap maxHeight to prevent drawing beyond screen edge
- Pre-compute layout in onEnter() with InfoField struct (wrappedText
  called once, not per frame)
- Add cover image display via generateThumbBmp + drawBitmap1Bit

Made-with: Cursor

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2026-02-12_merge-master-into-mod-master.md

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2026-02-13_cleanup-summary.md

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2026-02-13_letterbox-fill-redesign.md

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2026-02-15_cover-thumbnail-fix.md

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2026-02-15_merge-master-css-perf.md

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2026-02-17_home-highlight-fixes.md

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2026-02-19_sleep-double-fast-refresh-summary.md

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mod: restore missing mod features from resync audit

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mod: restore missing mod features from resync audit

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mod: restore missing mod features from resync audit

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docs: add chat summaries for upstream sync and bug fix sessions

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docs: add chat summaries for upstream sync and bug fix sessions

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docs: add chat summaries for upstream sync and bug fix sessions

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docs: update tracking for ported PRs #1329, #1143, #1172, #1320, #1325

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docs: add chat summary for three reader bug fixes

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port: upstream PRs #1311 (inter-word spacing fix) and #1322 (zip early exit)

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port: upstream PRs #1311 (inter-word spacing fix) and #1322 (zip early exit)

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port: upstream PR #1342 - Book Info screen, richer metadata, safer controls

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2026-03-09_00-44-summary.md

fix: BookInfo performance — Y-culling, newline normalization, cover clamping

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