PDF input:
• lib/ai/pdf.ts wraps pdfjs-dist (Apache-2.0). Worker is bound via
Vite's `?worker` suffix so the heavy parsing runs off-main-thread.
• AiCardGen gains a "📄 PDF laden" button that pipes extracted text
into the same textarea — the user can review/trim before
generation. Reading state shows file name + page count + chars.
Heatmap:
• queries.useStudyHeatmap(weeks=12) fills gaps with count=0 so the
grid renders without holes.
• StudyHeatmap.svelte: 7 rows × N columns (Monday-anchored), 5
intensity buckets (neutral → emerald-300), tooltip per cell with
date + count, legend strip.
• Mounted on the dashboard between the deck list and the Anki import
so the user lands on a quick visual progress receipt every visit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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