fix: handle "every day [at HH:MM]" in ParseSchedule and fix testifylint warning

pkg/parser/schedule_parser.go

@@ -188,6 +188,31 @@ func (p *ScheduleParser) parseInterval() (string, error) {
 		}
 	}
 
+	// Handle "every day [at HH:MM]" as an alias for a daily schedule.
+	// Examples: "every day" (2 tokens), "every day on weekdays" (4 tokens),
+	// or "every day at 9am" (4+ tokens with "at" at index 2).
+	if p.tokens[1] == "day" || p.tokens[1] == "days" {
+		// len == 2: "every day"; len == 4 with weekdays suffix: "every day on weekdays"
+		if len(p.tokens) == 2 || (len(p.tokens) == 4 && hasWeekdaysSuffix) {
+			// "every day" or "every day on weekdays" — fuzzy daily schedule
+			if hasWeekdaysSuffix {
+				return "FUZZY:DAILY_WEEKDAYS * * *", nil
+			}
+			return "FUZZY:DAILY * * *", nil
+		}
+		// tokens[2] == "at": "every day at HH:MM" — token layout is [every, day, at, time...]
+		if len(p.tokens) > 2 && p.tokens[2] == "at" {
+			// extractTime handles the "at" keyword at index 2 and reads the time token(s) after it
+			timeStr, err := p.extractTime(2)
+			if err != nil {
+				return "", err
+			}
+			min, hr := parseTime(timeStr)
+			return fmt.Sprintf("%s %s * * *", min, hr), nil
+		}
+		return "", errors.New("invalid 'every day' format, use 'every day' or 'every day at HH:MM'")
+	}
+
 	// Fall back to original parsing for "every N minutes" format
 	minTokens := 3
 	if hasWeekdaysSuffix {

pkg/parser/schedule_parser_fuzz_test.go

@@ -126,6 +126,12 @@ func FuzzScheduleParser(f *testing.F) {
 	f.Add("hourly on weekdays")
 	f.Add("every 2h on weekdays")
 	f.Add("every 2 hours on weekdays")
+	f.Add("every day")
+	f.Add("every day on weekdays")
+	f.Add("every day at 9am")
+	f.Add("every day at 14:30")
+	f.Add("every day at midnight")
+	f.Add("every day at noon")
 
 	// UTC offset schedules
 	f.Add("daily at 02:00 utc+9")

pkg/parser/schedule_parser_test.go

@@ -831,6 +831,68 @@ func TestParseSchedule(t *testing.T) {
 			expectedCron: "0 0 * * *",
 			expectedOrig: "every 1 day",
 		},
+
+		// "every day [at TIME]" — natural-language daily alias
+		{
+			name:         "every day (fuzzy)",
+			input:        "every day",
+			expectedCron: "FUZZY:DAILY * * *",
+			expectedOrig: "every day",
+		},
+		{
+			name:         "every days (plural, fuzzy)",
+			input:        "every days",
+			expectedCron: "FUZZY:DAILY * * *",
+			expectedOrig: "every days",
+		},
+		{
+			name:         "every day on weekdays",
+			input:        "every day on weekdays",
+			expectedCron: "FUZZY:DAILY_WEEKDAYS * * *",
+			expectedOrig: "every day on weekdays",
+		},
+		{
+			name:         "every day at 9am",
+			input:        "every day at 9am",
+			expectedCron: "0 9 * * *",
+			expectedOrig: "every day at 9am",
+		},
+		{
+			name:         "every day at 09:00",
+			input:        "every day at 09:00",
+			expectedCron: "0 9 * * *",
+			expectedOrig: "every day at 09:00",
+		},
+		{
+			name:         "every day at 14:30",
+			input:        "every day at 14:30",
+			expectedCron: "30 14 * * *",
+			expectedOrig: "every day at 14:30",
+		},
+		{
+			name:         "every day at midnight",
+			input:        "every day at midnight",
+			expectedCron: "0 0 * * *",
+			expectedOrig: "every day at midnight",
+		},
+		{
+			name:         "every day at noon",
+			input:        "every day at noon",
+			expectedCron: "0 12 * * *",
+			expectedOrig: "every day at noon",
+		},
+		{
+			name:         "every day at 6pm",
+			input:        "every day at 6pm",
+			expectedCron: "0 18 * * *",
+			expectedOrig: "every day at 6pm",
+		},
+		{
+			name:           "every day with unrecognised extra token",
+			input:          "every day around 9am",
+			shouldError:    true,
+			errorSubstring: "invalid 'every day' format",
+		},
 		{
 			name:           "weekly without on",
 			input:          "weekly monday",

pkg/parser/spec_test.go

@@ -545,7 +545,7 @@ func TestSpec_PublicAPI_NewFormattedParserError(t *testing.T) {
 	t.Run("empty message is preserved", func(t *testing.T) {
 		err := NewFormattedParserError("")
 		require.NotNil(t, err, "NewFormattedParserError should return non-nil for empty message")
-		assert.Equal(t, "", err.Error(),
+		assert.Empty(t, err.Error(),
 			"NewFormattedParserError should preserve empty message")
 	})
 }