feat(tui): add tag autocomplete and query composition

Tag autocomplete shows suggestions when typing #partial in capture bar.
Tab/enter accepts, up/down navigates, esc dismisses.

Query composition extends ? search with date filters (@today, @week,
@month, <7d, >30d), card type filters (^snippet), all composable
with existing text and tag filters.

internal/parse/grammar_test.go

@@ -158,6 +158,67 @@ func TestParse(t *testing.T) {
 	}
 }
 
+func TestParseQueryComposition(t *testing.T) {
+	tests := []struct {
+		name         string
+		input        string
+		wantBody     string
+		wantTags     []string
+		wantDateFrom bool
+		wantDateTo   bool
+		wantCardType *string
+	}{
+		{"today", "?@today", "", nil, true, true, nil},
+		{"yesterday", "?@yesterday", "", nil, true, true, nil},
+		{"week", "?@week", "", nil, true, false, nil},
+		{"month", "?@month", "", nil, true, false, nil},
+		{"newer than", "?<7d", "", nil, true, false, nil},
+		{"older than", "?>30d", "", nil, false, true, nil},
+		{"card type snippet", "?^snippet", "", nil, false, false, sp("snippet")},
+		{"card type shorthand", "?^c", "", nil, false, false, sp("snippet")},
+		{"card type checklist", "?^checklist", "", nil, false, false, sp("checklist")},
+		{"invalid card type stays as body", "?^bogus", "^bogus", nil, false, false, nil},
+		{"combined text and date", "?deploy @today", "deploy", nil, true, true, nil},
+		{"combined tags and date", "?#ops @week", "", []string{"ops"}, true, false, nil},
+		{"combined all", "?deploy #ops @week ^snippet", "deploy", []string{"ops"}, true, false, sp("snippet")},
+		{"invalid age stays as body", "?>abcd", ">abcd", nil, false, false, nil},
+		{"zero days stays as body", "?>0d", ">0d", nil, false, false, nil},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := Parse(tt.input)
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if !got.Query {
+				t.Fatal("expected Query=true")
+			}
+			if got.Body != tt.wantBody {
+				t.Errorf("body: got %q, want %q", got.Body, tt.wantBody)
+			}
+			if !tagsEq(got.FilterTags, tt.wantTags) {
+				t.Errorf("tags: got %v, want %v", got.FilterTags, tt.wantTags)
+			}
+			if tt.wantDateFrom && got.QueryDateFrom == nil {
+				t.Error("expected QueryDateFrom to be set")
+			}
+			if !tt.wantDateFrom && got.QueryDateFrom != nil {
+				t.Errorf("expected QueryDateFrom nil, got %v", *got.QueryDateFrom)
+			}
+			if tt.wantDateTo && got.QueryDateTo == nil {
+				t.Error("expected QueryDateTo to be set")
+			}
+			if !tt.wantDateTo && got.QueryDateTo != nil {
+				t.Errorf("expected QueryDateTo nil, got %v", *got.QueryDateTo)
+			}
+			if !ptrEq(got.QueryCardType, tt.wantCardType) {
+				t.Errorf("card type: got %v, want %v", strPtr(got.QueryCardType), strPtr(tt.wantCardType))
+			}
+		})
+	}
+}
+
 func ptrEq(a, b *string) bool {
 	if a == nil && b == nil {
 		return true