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, 4 insertions, 2 deletions

diff --git a/internal/tui/tui_test.go b/internal/tui/tui_test.go
index d4aa855..68e09b5 100644
--- a/internal/tui/tui_test.go
+++ b/internal/tui/tui_test.go
@@ -153,12 +153,14 @@ func TestDayInfoLineOmittedWhenEmpty(t *testing.T) {
 // TestFooterKeysLocalised checks the footer keybar text follows
 // cfg.UILanguage.
 func TestFooterKeysLocalised(t *testing.T) {
-	en := Model{cfg: config.Config{UILanguage: "en"}, date: "2026-07-22"}
+	// Give the model a real terminal width so the one-line keybar is not wrapped
+	// across lines (the 80-col View() fallback would split "q quit").
+	en := Model{cfg: config.Config{UILanguage: "en"}, date: "2026-07-22", width: 120}
 	if out := en.View(); !strings.Contains(out, "q quit") {
 		t.Errorf("en View() footer missing %q: %q", "q quit", out)
 	}
 
-	pl := Model{cfg: config.Config{UILanguage: "pl"}, date: "2026-07-22"}
+	pl := Model{cfg: config.Config{UILanguage: "pl"}, date: "2026-07-22", width: 120}
 	if out := pl.View(); !strings.Contains(out, "q wyjście") {
 		t.Errorf("pl View() footer missing %q: %q", "q wyjście", out)
 	}