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/migrate.ts

@@ -1,7 +1,25 @@
 import type { SqliteDb } from './types'
 import schemaV1 from './schema-v1.sql?raw'
+import schemaV2 from './schema-v2.sql?raw'
 
-const CURRENT_VERSION = 1
+const CURRENT_VERSION = 2
+
+function tryAlter(db: SqliteDb, sql: string): void {
+  try {
+    db.exec(sql)
+  } catch (err) {
+    const msg = err instanceof Error ? err.message : String(err)
+    if (!msg.includes('duplicate column')) throw err
+  }
+}
+
+function applyV2(db: SqliteDb): void {
+  tryAlter(db, "ALTER TABLE chapters ADD COLUMN publish_status TEXT NOT NULL DEFAULT 'draft'")
+  tryAlter(db, 'ALTER TABLE chapters ADD COLUMN pov_character_id TEXT DEFAULT NULL')
+  tryAlter(db, "ALTER TABLE chapters ADD COLUMN summary TEXT DEFAULT ''")
+  tryAlter(db, 'ALTER TABLE chapters ADD COLUMN story_time TEXT DEFAULT NULL')
+  db.exec(schemaV2)
+}
 
 export function migrate(db: SqliteDb): void {
   db.exec(`CREATE TABLE IF NOT EXISTS schema_version (
@@ -11,12 +29,17 @@ export function migrate(db: SqliteDb): void {
   )`)
 
   const row = db.prepare('SELECT MAX(version) AS v FROM schema_version').get() as { v: number | null }
-  const current = row?.v ?? 0
+  let current = row?.v ?? 0
   if (current >= CURRENT_VERSION) return
 
-  db.exec(schemaV1)
-  db.prepare('INSERT INTO schema_version (version, description) VALUES (?, ?)').run(
-    CURRENT_VERSION,
-    'initial schema'
-  )
+  if (current < 1) {
+    db.exec(schemaV1)
+    db.prepare('INSERT INTO schema_version (version, description) VALUES (?, ?)').run(1, 'initial schema')
+    current = 1
+  }
+
+  if (current < 2) {
+    applyV2(db)
+    db.prepare('INSERT INTO schema_version (version, description) VALUES (?, ?)').run(2, 'P2 schema')
+  }
 }