reading: split the book tracker into books, papers and articles (kind column + migration classifying 20 papers), segmented tabs with counts, article cards that open the link, owner + add link with server-side unfurl, kind switch on detail pages, /trackers/reading alias

drizzle/20261025133601_reading_kinds/migration.sql

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+CREATE TYPE "books"."kind" AS ENUM('book', 'paper', 'article');--> statement-breakpoint
+ALTER TABLE "books"."works" ADD COLUMN "kind" "books"."kind" DEFAULT 'book'::"books"."kind" NOT NULL;--> statement-breakpoint
+ALTER TABLE "books"."works" ADD COLUMN "url" text;--> statement-breakpoint
+ALTER TABLE "books"."works" ADD COLUMN "site_name" text;--> statement-breakpoint
+ALTER TABLE "books"."works" ADD COLUMN "published_at" timestamp with time zone;--> statement-breakpoint
+CREATE UNIQUE INDEX "works_url_key" ON "books"."works" ("url") WHERE "url" is not null;--> statement-breakpoint
+CREATE INDEX "works_kind_idx" ON "books"."works" ("kind");--> statement-breakpoint
+-- Classify existing papers: anything with an arXiv id, or a short ISBN-less PDF from the Drive
+-- "Papers/" folder (Ilya Sutskever's list). Longer works in that folder (Kolmogorov
+-- Complexity, Machine Super Intelligence) stay books.
+UPDATE "books"."works" SET "kind" = 'paper'
+WHERE "source_refs" ? 'arxiv'
+	OR ("isbn13" IS NULL AND coalesce("page_count", 0) BETWEEN 1 AND 99
+		AND EXISTS (SELECT 1 FROM jsonb_array_elements_text(CASE WHEN jsonb_typeof("source_refs"->'drive') = 'array' THEN "source_refs"->'drive' ELSE '[]'::jsonb END) d WHERE d LIKE 'Papers/%'));