refactor: remove the niedziela/missalemeum scrapers, bt, traditional_lang

The daily view now computes entirely offline (previous commit), so retire the
network path and everything that served it:

- Delete internal/tradlit (missalemeum) and the niedziela scraper from
  internal/liturgy (fetch/store/parse + fixtures); keep Section, DayInfo and
  ExtractCitation.
- Remove the "bt" version everywhere (render gatherBT + branches, config,
  i18n, web form, TUI) and bible.ToEnglishRef (Polish citation converter).
  A legacy config carrying "bt" migrates to "wuj" on load (config.migrateBT).
- Remove the traditional_lang config field and the -g/--lang flag from all
  three binaries.
- Drop the now-dead flags -R/--refresh, -o/--offline, -u/--update,
  -C/--clean and the harvest/clean commands.
- New defaults: versions = wuj,vul,grb,drb; default_version = vul.

Update the README (offline-by-design, no harvest/update), help text, and
stale niedziela/bt doc comments. Tests updated for the offline reality;
go test ./... and go vet ./... are clean, all three binaries build and run
offline (OF + EF, compare, web).

1 files changed, 3 insertions, 5 deletions

diff --git a/internal/i18n/i18n_test.go b/internal/i18n/i18n_test.go
index 79479e8..79f3009 100644
--- a/internal/i18n/i18n_test.go
+++ b/internal/i18n/i18n_test.go
@@ -28,8 +28,6 @@ func TestVersionLabels(t *testing.T) {
 	cases := []struct {
 		lang, code, want string
 	}{
-		{"en", "bt", "Biblia Tysiąclecia (niedziela.pl)"},
-		{"pl", "bt", "Biblia Tysiąclecia (niedziela.pl)"},
 		{"en", "wuj", "Wujek (Polish)"},
 		{"pl", "wuj", "Wujek (pol.)"},
 		{"en", "vul", "Vulgate (Latin)"},
@@ -50,10 +48,10 @@ func TestTUIStrings(t *testing.T) {
 	en := Get("en")
 	pl := Get("pl")
 
-	if en.FooterKeys != "tab/⇧tab version  ←/→ day  d date  j/k scroll  space/b page  g/G top/bottom  r refresh  q quit" {
+	if en.FooterKeys != "tab/⇧tab version  ←/→ day  d date  j/k scroll  space/b page  g/G top/bottom  q quit" {
 		t.Errorf("en.FooterKeys = %q", en.FooterKeys)
 	}
-	if pl.FooterKeys != "tab/⇧tab wersja  ←/→ dzień  d data  j/k przewiń  spacja/b strona  g/G góra/dół  r odśwież  q wyjście" {
+	if pl.FooterKeys != "tab/⇧tab wersja  ←/→ dzień  d data  j/k przewiń  spacja/b strona  g/G góra/dół  q wyjście" {
 		t.Errorf("pl.FooterKeys = %q", pl.FooterKeys)
 	}
 	if en.Loading != "loading…" || pl.Loading != "ładowanie…" {
@@ -74,7 +72,7 @@ func TestTUIStrings(t *testing.T) {
 	if strings.HasSuffix(en.ErrorPrefix, "  ") || strings.HasSuffix(pl.ErrorPrefix, "  ") {
 		t.Errorf("ErrorPrefix has 2+ trailing spaces: en=%q pl=%q", en.ErrorPrefix, pl.ErrorPrefix)
 	}
-	if en.ErrorHint != "change date (←/→) or refresh (r)" || pl.ErrorHint != "zmień datę (←/→) lub odśwież (r)" {
+	if en.ErrorHint != "change date (←/→)" || pl.ErrorHint != "zmień datę (←/→)" {
 		t.Errorf("ErrorHint en=%q pl=%q", en.ErrorHint, pl.ErrorHint)
 	}
 }