Field notebook: capture NPC lines, tear pages onto the board

A dialogue line gains a "✎ Note this" capture that saves it to a
per-playthrough notebook (migration 035 + notebook endpoints). The inventory
notebook lists captured pages in a handwriting font (Google "Reenie Beanie")
and "✂ Tear to board" drops a page onto the current board as a note exhibit
(reusing addNote), then removes the page. Board notes render handwritten too.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

migrations/035_notebook.sql

@@ -0,0 +1,10 @@
+-- The player's field notebook: lines captured from NPCs during play, per playthrough.
+-- A page can later be torn onto the board as a note exhibit.
+CREATE TABLE osint.notebook_pages (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  playthrough_id UUID NOT NULL REFERENCES osint.playthroughs(id) ON DELETE CASCADE,
+  text TEXT NOT NULL,
+  source_utterance_id UUID REFERENCES osint.utterances(id) ON DELETE SET NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX notebook_pages_playthrough_idx ON osint.notebook_pages (playthrough_id, created_at);