Reframe as a linkable, cited callout ("nohello for charts")

Make each sin a self-contained page you send instead of re-explaining:

- Per-sin "poke" one-liner (the shareable callout)
- Citations system: a canonical bibliography (src/lib/references.ts) of the
  field's giants — Munzner, Knaflic, Tufte, Cairo, Few, Cleveland & McGill,
  Wilke, Healy, Calling Bullshit, data-to-viz, Junk Charts, Spurious
  Correlations, FT Visual Vocabulary — cited per sin with a relevance note
- "Don't take our word for it" receipts block on each sin
- /canon page: the full annotated bibliography
- Share control: copy-link "send them the receipt" (progressive enhancement)
- Restructured sin page: poke -> proof -> why -> receipts -> share
- Header nav (Sins / Canon); homepage reframed to the "send the link" mission

Also fix the truncated-axis bad chart: clamp the [90,100] domain so the bar
baseline doesn't overflow thousands of pixels off-canvas.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPEvmMbac2fCvKXpQcovj8

src/content.config.ts

@@ -11,6 +11,13 @@ const sins = defineCollection({
     title: z.string(),
     // Short one-line summary shown on the index gallery.
     summary: z.string(),
+    // The cheeky one-line callout — the thing you send the sinner.
+    poke: z.string(),
+    // Citations into the canon (src/lib/references.ts) with a per-sin note on
+    // why that source is relevant. This is the "don't take our word for it".
+    citations: z
+      .array(z.object({ key: z.string(), note: z.string().optional() }))
+      .default([]),
     // Grouping, e.g. "Misleading Scales", "Chart-Type Abuse".
     category: z.string(),
     // 1 (venial) … 5 (mortal). Drives the flame rating in the UI.