the documented way to use this did not work

`import qs.horologion.modules` was the README's headline instruction and it
fails outright: Quickshell resolves `qs` against the host config root, not
the subtree, so in an empty shell the type is unavailable and in a populated
one the widget would have silently bound to the host's Config and Theme
instead of its own. The imports inside are now relative and each directory
carries a qmldir, so `import "horologion/modules"` works in any host and the
three pieces really are usable on their own.

  - refresh() dropped a request made while a run was in flight, so a
    jurisdiction or date set a moment after startup never took effect until
    midnight. It queues now.
  - The waybar script exited non-zero on its error paths, and waybar hides a
    module whose script does that -- so a missing typikon made the module
    vanish rather than say so, and the .error CSS was dead. An unrecognised
    --format field raised instead of rendering empty, and the tooltip
    interpolated unescaped text into Pango markup, which matters because
    --update-menaion fetches commemorations from a page nobody here controls.
  - The installer aborted the whole run at the point where it printed
    'leaving it alone', and a wholly successful run exited 1 because the last
    statement was a failed [ -d ] test under set -e. --help demanded typikon,
    which is what --help would have told you to install.
  - eww painted every day with the feast colour and printed a dangling
    separator, because it compares against "" and eww renders a JSON null as
    the string "null". The parenthesised ?: form two lines away was already
    right. The week list also repeated today.

pip install typikon installed nothing; there is no such package, and that was
the first line of every install path. Pascha now carries its label instead of
being a bare ISO date in a corner.

tests/smoke.sh covers the scripts, which is where all of this lived and where
nothing was covered. It caught two of these while being written.

tests/smoke.sh

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+# Smoke tests for the front ends. Run: tests/smoke.sh
+#
+# These exist because every bug found in the first review of this repo was in
+# the shell and Python around the QML, not in the QML: a --format field that
+# raised, an installer that aborted where it said it was continuing, an error
+# path that exited non-zero so waybar hid the message it was trying to show.
+# None of it was covered by anything.
+set -uo pipefail
+
+root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+waybar="$root/bin/horologion-waybar"
+install="$root/bin/horologion-install"
+pass=0 fail=0
+tmp="$(mktemp -d)"
+trap 'rm -rf "$tmp"' EXIT
+
+ok()   { pass=$((pass+1)); printf '  ok    %s\n' "$1"; }
+bad()  { fail=$((fail+1)); printf '  FAIL  %s\n     %s\n' "$1" "${2:-}"; }
+
+check() {                       # check <name> <expected-exit> <cmd...>
+    local name="$1" want="$2"; shift 2
+    local out; out="$("$@" 2>&1)"; local got=$?
+    [ "$got" = "$want" ] || { bad "$name" "exit $got, wanted $want"; return; }
+    ok "$name"
+}
+
+json() {                        # json <name> <cmd...> -- stdout must parse
+    local name="$1"; shift
+    local out; out="$("$@" 2>/dev/null)"
+    if printf '%s' "$out" | python3 -c 'import json,sys; json.load(sys.stdin)' 2>/dev/null
+    then ok "$name"; else bad "$name" "not JSON: ${out:0:80}"; fi
+}
+
+echo
+echo "  waybar module"
+command -v typikon >/dev/null 2>&1 || { echo "  SKIP: typikon not on PATH"; exit 77; }
+json  "plain run emits JSON"                "$waybar"
+json  "an unknown --format field"           "$waybar" --format '{nosuchfield}'
+json  "a positional --format field"         "$waybar" --format '{0}'
+json  "an unclosed --format brace"          "$waybar" --format '{'
+json  "--no-emoji"                          "$waybar" --no-emoji
+json  "--days 1"                            "$waybar" --days 1
+json  "an unknown jurisdiction"             "$waybar" -j atlantis
+# waybar hides a module whose script exits non-zero, so every path must be 0
+# or the error JSON is never read.
+# A PATH that still has an interpreter but no typikon -- typikon installs to
+# ~/.local/bin, which this leaves out. Emptying PATH entirely would only prove
+# that the shebang cannot find python3.
+check "exit 0 when typikon is missing"  0   env PATH=/usr/bin:/bin "$waybar"
+json  "JSON when typikon is missing"        env PATH=/usr/bin:/bin "$waybar"
+check "exit 0 on a bad jurisdiction"    0   "$waybar" -j atlantis
+
+out="$("$waybar" --format '{daysToPascha}' 2>/dev/null)"
+case "$out" in
+    *'"text": ""'*) bad "a zero field is not blanked" "daysToPascha rendered empty" ;;
+    *)              ok  "a zero field is not blanked" ;;
+esac
+
+echo
+echo "  installer"
+check "--help without typikon"          0   env PATH=/usr/bin:/bin "$install" --help
+check "an unknown subcommand"           2   "$install" nonsense
+mkdir -p "$tmp/a/.config/quickshell" "$tmp/a/.config/waybar"
+check "a clean run with eww absent"     0   env HOME="$tmp/a" XDG_CONFIG_HOME="$tmp/a/.config" "$install" all
+mkdir -p "$tmp/b/.local/bin" "$tmp/b/.config"; : > "$tmp/b/.local/bin/horologion-waybar"
+check "a real file at the target"       1   env HOME="$tmp/b" XDG_CONFIG_HOME="$tmp/b/.config" "$install" all
+[ -L "$tmp/a/.local/bin/horologion-waybar" ] \
+    && ok "the clean run actually linked" || bad "the clean run actually linked"
+
+echo
+echo "  syntax"
+check "installer parses"                0   bash -n "$install"
+check "waybar module compiles"          0   python3 -m py_compile "$waybar"
+rm -rf "$root/bin/__pycache__"
+for f in "$root"/quickshell/*.qml "$root"/quickshell/*/*.qml; do
+    [ -f "$f" ] || continue
+    grep -q . "$f" || bad "empty QML: $f"
+done
+ok "QML files are non-empty"
+
+echo
+printf '  %d passed, %d failed\n\n' "$pass" "$fail"
+[ "$fail" -eq 0 ]