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, 2 insertions, 1 deletions

diff --git a/internal/cli/pager_test.go b/internal/cli/pager_test.go
index 3882162..4850e5e 100644
--- a/internal/cli/pager_test.go
+++ b/internal/cli/pager_test.go
@@ -97,7 +97,8 @@ func TestIsTerminalWriterBuffer(t *testing.T) {
 func TestPagerFlagDoesNotBreakBufferOutput(t *testing.T) {
 	t.Setenv("XDG_CONFIG_HOME", t.TempDir())
 	var out, errb bytes.Buffer
-	code := Run([]string{"-P", "-o", "-l", "trad"}, nil, &out, &errb)
+	// (The former -o/--offline flag is gone: the daily view is always offline.)
+	code := Run([]string{"-P", "-l", "trad", "2026-07-22"}, nil, &out, &errb)
 	if code != 0 && code != 1 {
 		t.Fatalf("-P run code=%d (stderr=%q)", code, errb.String())
 	}