feat: deliver P2 v0.2.0 with unified editor, search, and snapshots

Implement schema v2 migration, outline/setting/inspiration CRUD, unified TipTap editing, reference panel with mentions, FTS global search, chapter version history, writing landmarks, word frequency analysis, light theme contrast fixes, and full unit/E2E test coverage.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main/db/schema-v2.sql

@@ -0,0 +1,70 @@
+CREATE TABLE IF NOT EXISTS outline_items (
+    id                  TEXT PRIMARY KEY,
+    parent_id           TEXT,
+    title               TEXT NOT NULL,
+    description         TEXT DEFAULT '',
+    status              TEXT NOT NULL DEFAULT 'pending',
+    expected_word_count INTEGER DEFAULT NULL,
+    chapter_id          TEXT,
+    sort_order          INTEGER NOT NULL DEFAULT 0,
+    created_at          TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at          TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY (parent_id) REFERENCES outline_items(id) ON DELETE CASCADE,
+    FOREIGN KEY (chapter_id) REFERENCES chapters(id) ON DELETE SET NULL
+);
+
+CREATE TABLE IF NOT EXISTS settings (
+    id          TEXT PRIMARY KEY,
+    type        TEXT NOT NULL,
+    name        TEXT NOT NULL,
+    description TEXT DEFAULT '',
+    properties  TEXT DEFAULT '{}',
+    created_at  TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at  TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS setting_chapter_refs (
+    setting_id  TEXT NOT NULL,
+    chapter_id  TEXT NOT NULL,
+    PRIMARY KEY (setting_id, chapter_id),
+    FOREIGN KEY (setting_id) REFERENCES settings(id) ON DELETE CASCADE,
+    FOREIGN KEY (chapter_id) REFERENCES chapters(id) ON DELETE CASCADE
+);
+
+CREATE TABLE IF NOT EXISTS inspiration (
+    id          TEXT PRIMARY KEY,
+    title       TEXT NOT NULL DEFAULT '',
+    content     TEXT NOT NULL DEFAULT '',
+    tags        TEXT DEFAULT '[]',
+    created_at  TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at  TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS snapshots (
+    id          TEXT PRIMARY KEY,
+    chapter_id  TEXT NOT NULL,
+    type        TEXT NOT NULL,
+    name        TEXT DEFAULT '',
+    content     TEXT NOT NULL,
+    created_at  TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY (chapter_id) REFERENCES chapters(id) ON DELETE CASCADE
+);
+
+CREATE TABLE IF NOT EXISTS bookmarks (
+    id            TEXT PRIMARY KEY,
+    chapter_id    TEXT NOT NULL,
+    position      INTEGER NOT NULL,
+    label         TEXT NOT NULL,
+    landmark_type TEXT NOT NULL DEFAULT 'todo',
+    resolved      INTEGER NOT NULL DEFAULT 0,
+    created_at    TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY (chapter_id) REFERENCES chapters(id) ON DELETE CASCADE
+);
+
+CREATE VIRTUAL TABLE IF NOT EXISTS search_fts USING fts5(
+    source_kind,
+    source_id,
+    title,
+    body,
+    tokenize='unicode61'
+);