split globalfilter presentation and parsing into sub-packages

Move ParseDurationNs to globalfilter/parser and move CompareOpSymbol,
AppendStringSummary, AppendNumericSummary, FilterSummary to
globalfilter/presenter. The domain Filter type retains only matching,
equality, clone, and active-predicate logic. All callers updated;
tests for the new sub-packages added.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

3 files changed, 14 insertions, 6 deletions

diff --git a/internal/tui/eventstream/filter.go b/internal/tui/eventstream/filter.go
index 61d8c33..801b8ba 100644
--- a/internal/tui/eventstream/filter.go
+++ b/internal/tui/eventstream/filter.go
@@ -1,6 +1,9 @@
 package eventstream
 
-import "ior/internal/globalfilter"
+import (
+	"ior/internal/globalfilter"
+	"ior/internal/globalfilter/parser"
+)
 
 type CompareOp = globalfilter.CompareOp
 type NumericFilter = globalfilter.NumericFilter
@@ -16,6 +19,8 @@ const (
 	OpLte = globalfilter.OpLte
 )
 
+// ParseDurationNs delegates to parser.ParseDurationNs, re-exporting the
+// duration parsing helper for eventstream callers.
 func ParseDurationNs(input string) (int64, error) {
-	return globalfilter.ParseDurationNs(input)
+	return parser.ParseDurationNs(input)
 }
diff --git a/internal/tui/eventstream/filter_test.go b/internal/tui/eventstream/filter_test.go
index 0413904..efedbe4 100644
--- a/internal/tui/eventstream/filter_test.go
+++ b/internal/tui/eventstream/filter_test.go
@@ -3,6 +3,8 @@ package eventstream
 import (
 	"strings"
 	"testing"
+
+	"ior/internal/globalfilter/presenter"
 )
 
 func sampleEvent() StreamEvent {
@@ -31,8 +33,8 @@ func TestFilterZeroValueMatchesAll(t *testing.T) {
 	if f.IsActive() {
 		t.Fatalf("zero-value filter should be inactive")
 	}
-	if got := f.Summary(); got != "all" {
-		t.Fatalf("Summary() = %q, want all", got)
+	if got := presenter.FilterSummary(f); got != "all" {
+		t.Fatalf("FilterSummary() = %q, want all", got)
 	}
 }
 
@@ -120,7 +122,7 @@ func TestFilterSummaryIncludesActivePredicates(t *testing.T) {
 		PID:        &NumericFilter{Op: OpEq, Value: 1234},
 		LatencyNs:  &NumericFilter{Op: OpGt, Value: 1000000},
 	}
-	got := f.Summary()
+	got := presenter.FilterSummary(f)
 	for _, wantPart := range []string{"errors", "syscall~read", "pid=1234", "latency>1ms"} {
 		if !strings.Contains(got, wantPart) {
 			t.Fatalf("Summary() = %q, missing %q", got, wantPart)
diff --git a/internal/tui/eventstream/render.go b/internal/tui/eventstream/render.go
index 4d7970b..cd4d528 100644
--- a/internal/tui/eventstream/render.go
+++ b/internal/tui/eventstream/render.go
@@ -5,6 +5,7 @@ import (
 	"strconv"
 	"strings"
 
+	"ior/internal/globalfilter/presenter"
 	"ior/internal/tui/common"
 
 	"charm.land/lipgloss/v2"
@@ -75,7 +76,7 @@ func renderStatusLine(paused bool, totalCount, filteredCount, bufferLen, bufferC
 }
 
 func renderFilterLine(filter Filter) string {
-	summary := filter.Summary()
+	summary := presenter.FilterSummary(filter)
 	if summary == "all" {
 		summary = common.HighlightStyle.Render(summary)
 	}