test(bible): skip corpus-dependent tests when optional corpora aren't embedded

Since 51c0f4e split the corpora (only vul embedded by default; wuj/drb/grb
behind -tags fullbible), `go test ./...` on the default build was red across six
packages -- every failure was a test assuming an optional corpus is present.

Guard those assertions with a skip keyed on bible.Meta(code), so they run under
-tags fullbible and skip -- not fail -- on the default vul-only build. Mixed
tests are split into subtests so the always-embedded vul assertions and pure
logic (pl->vul fallback, explicit passthrough, bt-rejection, i18n labels) keep
running on both builds. Test-only change; no product code or corpora touched.

- internal/bible: TestVerses, TestLookup, TestCorpusBooks, TestChapters,
  TestGrbNoApparatusMarkers, TestCrossChapterRange* (requireCorpus helper).
- internal/cli, config, render, tui, web: the same pattern for their
  corpus-dependent tests.
- Fixes an index-out-of-range panic in internal/tui's reader tests that was
  aborting the package binary and masking 3 further corpus-absence failures
  (TestReaderBookmarkFlow, TestReaderChapterJump, TestReaderRemembersPlace).

Verified: `go test ./...` and `go test -tags fullbible ./...` both green (0 FAIL);
guards active only on the default build (29 skips vs 1 unrelated pre-existing);
gofmt and go vet clean.

1 files changed, 27 insertions, 9 deletions

diff --git a/internal/bible/bible_test.go b/internal/bible/bible_test.go
index 71a2c89..e3c18c8 100644
--- a/internal/bible/bible_test.go
+++ b/internal/bible/bible_test.go
@@ -14,24 +14,40 @@ func TestVerses(t *testing.T) {
 		{"wuj", "Wisdom", 3, 1, "A dusze sprawiedliwych"}, // deuterocanonical
 	}
 	for _, c := range cases {
-		vs := Verses(c.version, c.book, c.chap)
-		var got string
-		for _, v := range vs {
-			if v.Verse == c.verse {
-				got = v.Text
+		t.Run(c.version+"/"+c.book, func(t *testing.T) {
+			requireCorpus(t, c.version)
+			vs := Verses(c.version, c.book, c.chap)
+			var got string
+			for _, v := range vs {
+				if v.Verse == c.verse {
+					got = v.Text
+				}
 			}
-		}
-		if !hasPrefix(got, c.wantPrefix) {
-			t.Errorf("%s %s %d:%d = %q want prefix %q", c.version, c.book, c.chap, c.verse, got, c.wantPrefix)
-		}
+			if !hasPrefix(got, c.wantPrefix) {
+				t.Errorf("%s %s %d:%d = %q want prefix %q", c.version, c.book, c.chap, c.verse, got, c.wantPrefix)
+			}
+		})
 	}
 }
 
 func hasPrefix(s, p string) bool { return len(s) >= len(p) && s[:len(p)] == p }
 
+// requireCorpus skips the test when corpus `code` is not available. The optional
+// corpora (wuj, drb, grb) are compiled in only with `-tags fullbible` (or dropped
+// into the user corpora dir); without that, only vul is embedded. Keying on
+// Meta() means these tests run fully under fullbible and skip -- not fail --
+// under the default build, so `go test ./...` stays honest either way.
+func requireCorpus(t *testing.T, code string) {
+	t.Helper()
+	if _, ok := Meta(code); !ok {
+		t.Skipf("corpus %q not embedded; build with -tags fullbible", code)
+	}
+}
+
 // TestGrbNoApparatusMarkers guards the corpus fix: the SBLGNT apparatus sigla
 // (U+2E00–U+2E0D) were stripped from the Greek text.
 func TestGrbNoApparatusMarkers(t *testing.T) {
+	requireCorpus(t, "grb")
 	for _, v := range Verses("grb", "Luke", 16) {
 		for _, r := range v.Text {
 			if r >= 0x2E00 && r <= 0x2E0D {
@@ -53,6 +69,7 @@ func TestVul2Kings(t *testing.T) {
 }
 
 func TestCorpusBooks(t *testing.T) {
+	requireCorpus(t, "wuj")
 	books := CorpusBooks("wuj")
 	if len(books) == 0 {
 		t.Fatal("wuj corpus has no books")
@@ -72,6 +89,7 @@ func TestCorpusBooks(t *testing.T) {
 }
 
 func TestChapters(t *testing.T) {
+	requireCorpus(t, "wuj")
 	ch := Chapters("wuj", "John")
 	if len(ch) == 0 || ch[0] != 1 {
 		t.Fatalf("John chapters = %v", ch)