Math tracker (/trackers/math): Evan Chen's Napkin, chapter by chapter

Schema math (parts, chapters, sections, activity), seeded with all 100 chapters
(Ch 0-94, appendix A-E), 647 sections, PDF pages, exercise counts and approximate
prereqs. Triggers stamp started_at/completed_at and log status/exercise/note/section
changes; math.apply_progress(jsonb) applies the JSON format bots send. Private by
default via MATH_PRIVATE in #lib/math (owner-only prefix + lock in every tracker list).
Overall + per-part progress, current chapter, prereq hints, quick status buttons,
exercises stepper, notes, optional section ticks, activity log, dependency chart.
Deploy preflight checks the math schema (4 tables, 100 chapters).

src/lib/server/owner.ts

@@ -1,4 +1,5 @@
 import { error } from '@sveltejs/kit';
+import { MATH_PRIVATE } from '#lib/math.js';
 
 // The site has exactly one owner: Stan's account (prod auth.user id tfn6OZDOpiQvMARIH65HQ2XJuaVvmGEe).
 // Owner-only data, such as the health tracker, is gated on that account's email, not on
@@ -38,7 +39,9 @@ export const ownerOnlyPrefixes = [
 	'/api/spotify',
 	// Worldwide todo list: the list is public, the review queue and its API are mine only.
 	'/projects/worldwide-todo/queue',
-	'/projects/worldwide-todo/api/queue'
+	'/projects/worldwide-todo/api/queue',
+	// Math tracker (the Napkin): owner-only while MATH_PRIVATE (#lib/math) is on.
+	...(MATH_PRIVATE ? (['/trackers/math'] as const) : [])
 ] as const;
 
 /**
@@ -67,7 +70,8 @@ export const ownerWritePrefixes = [
 	'/trackers/pc',
 	'/trackers/notes',
 	'/trackers/ai',
-	'/trackers/movies'
+	'/trackers/movies',
+	'/trackers/math'
 ] as const;
 
 const normalise = (pathname: string) => pathname.toLowerCase().replace(/\/+$/, '');