feat(komga): add Komga read-status sync with reports and history

Adds Komga sync feature to import read status from a Komga server.
Books are matched by title (case-insensitive) with series+title primary
match and title-only fallback. Sync reports are persisted with matched,
newly marked, and unmatched book lists. UI shows check icon for newly
marked books, sorted to top. Credentials (URL+username) are saved
between sessions. Uses HashSet for O(1) lookups to handle large libraries.

Closes #2

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

infra/migrations/0024_add_komga_sync_reports.sql

@@ -0,0 +1,10 @@
+CREATE TABLE IF NOT EXISTS komga_sync_reports (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    komga_url TEXT NOT NULL,
+    total_komga_read BIGINT NOT NULL DEFAULT 0,
+    matched BIGINT NOT NULL DEFAULT 0,
+    already_read BIGINT NOT NULL DEFAULT 0,
+    newly_marked BIGINT NOT NULL DEFAULT 0,
+    unmatched JSONB NOT NULL DEFAULT '[]',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);