feat(unlinked-books): dismiss (ignore) or delete queue entries

Unidentified sync files used to be stuck: every KOReader re-sync
re-queues them, and there was no way to say "this isn't a book" or "I
don't want this one on the server".

Ignore is the durable dismiss: a new ignored_at column hides the row
from the page list, dashboard badge, and per-device API while the sync
keeps refreshing its metadata (the upsert never clears the column).
A collapsible "Ignored" section lists dismissed rows with Restore and
Delete so a misclick is recoverable. Delete is the hard exit — the row
is gone, and honestly re-queued if the device syncs that file again
(the confirm dialog says so).

Actions are page-scoped SSR routes: htmx swaps in the re-rendered
section so counts and buckets can never drift from the DB; ownership
is row → device → user (admins may act on any row). Integration tests
pin the lifecycle (hide everywhere, survive the sync upsert, restore,
delete), foreign-user 403s, and the render surface.

templates/partials_render_test.go

@@ -68,7 +68,7 @@ func TestDashboardUnlinkedBanner(t *testing.T) {
 	}
 }
 
-// The unlinked-books page renders queue rows standalone.
+// The unlinked-books page renders queue rows standalone, both buckets.
 func TestUnlinkedBooksPageRender(t *testing.T) {
 	var b strings.Builder
 	user := User{ID: "u1", Timezone: "UTC"}
@@ -81,11 +81,26 @@ func TestUnlinkedBooksPageRender(t *testing.T) {
 		TitleFromDevice: "Some Sideloaded Book",
 		LastSyncTime:    "2026-10-18 12:00",
 	}}
-	if err := UnlinkedBooks(user, books).Render(context.Background(), &b); err != nil {
+	ignored := []UnlinkedBookData{{
+		ProgressID:      "ub2",
+		DeviceName:      "KOReader Phone",
+		DeviceType:      "koreader",
+		FilePath:        "/sdcard/ignored.epub",
+		SHA256:          "def456",
+		TitleFromDevice: "Some Dismissed Book",
+		LastSyncTime:    "2026-10-18 12:00",
+	}}
+	if err := UnlinkedBooks(user, books, ignored).Render(context.Background(), &b); err != nil {
 		t.Fatalf("render: %v", err)
 	}
 	out := b.String()
-	for _, want := range []string{"Some Sideloaded Book", "abc123", `data-progress-id="ub1"`, "searchMatches"} {
+	for _, want := range []string{
+		"Some Sideloaded Book", "abc123", `data-progress-id="ub1"`, "searchMatches",
+		// Dismiss/delete actions and the ignored recovery bucket.
+		"Some Dismissed Book", `hx-post="/unlinked-books/ub1/ignore"`,
+		`hx-delete="/unlinked-books/ub1"`, `hx-post="/unlinked-books/ub2/unignore"`,
+		"Ignored (1)",
+	} {
 		if !strings.Contains(out, want) {
 			t.Errorf("unlinked page missing %q", want)
 		}