explorer: name the block's transaction count what the SPA reads

Block rows and block details rendered the Txn label with nothing after it.
Lux block 1106999 has 4 transactions by RPC and the page showed no number.

formatBlock emitted the column's own name, tx_count. The SPA's Block type
declares transactions_count and every render site reads it — BlocksTableItem,
BlocksListItem, LatestBlocksItem, BlockDetails — so the value arrived under a
key nobody looked up and each cell fell back to undefined. Rows that arrived
over the realtime channel DID show a count, which is what made this look like a
data problem rather than a naming one: that path already renames the field
(lib/socket/sse.ts toApiBlock), so the same block read correctly when pushed
and blank when fetched.

Renamed rather than aliased: nothing reads a block's tx_count, so a second
spelling would only be a second thing to keep in step. formatPlatformBlock gets
the same name — P-Chain rows go through the same block widgets.

The suite asserted the old key by PRESENCE, in three places, which is why a
rename is what it takes to notice. TestBlockFieldValues now pins the value:
want 3, got <nil> on the old name.

Co-authored-by: Hanzo Dev <[email protected]>

explorer/chains_evm_test.go

@@ -434,7 +434,7 @@ func testChain(t *testing.T, cd chainDef) {
 			t.Errorf("hash: want %s, got %v", wantHash, body["hash"])
 		}
 		// Response fields.
-		for _, field := range []string{"height", "hash", "parent_hash", "miner", "gas_limit", "gas_used", "timestamp", "tx_count", "type"} {
+		for _, field := range []string{"height", "hash", "parent_hash", "miner", "gas_limit", "gas_used", "timestamp", "transactions_count", "type"} {
 			if _, ok := body[field]; !ok {
 				t.Errorf("missing field %q", field)
 			}

explorer/explorer_test.go

@@ -127,7 +127,7 @@ func TestHandleListBlocks(t *testing.T) {
 		resp := formatBlock(maps[0])
 
 		// Verify required fields exist
-		for _, field := range []string{"height", "hash", "parent_hash", "miner", "size", "gas_limit", "gas_used", "timestamp", "tx_count", "type"} {
+		for _, field := range []string{"height", "hash", "parent_hash", "miner", "size", "gas_limit", "gas_used", "timestamp", "transactions_count", "type"} {
 			if _, ok := resp[field]; !ok {
 				t.Errorf("missing field: %s", field)
 			}

explorer/format.go

@@ -249,9 +249,16 @@ func formatBlock(b map[string]any) map[string]any {
 		"burnt_fees": "0",
 		"rewards":    []any{},
 		"timestamp":  fmtTimestamp(b["timestamp"]),
-		"tx_count":   col(b, "tx_count", "transaction_count"),
-		"state_root": nil,
-		"type":       "block",
+		// The SPA reads `transactions_count` on a block — its Block type
+		// declares that name and all nine render sites use it (block rows, the
+		// home page's latest-blocks list, block details). This emitted the
+		// column's own name, `tx_count`, so every REST-loaded row rendered the
+		// Txn label with nothing after it, while rows pushed over the realtime
+		// channel showed a number, because that path already renamed the field.
+		// One name, and it is the reader's.
+		"transactions_count": col(b, "tx_count", "transaction_count"),
+		"state_root":         nil,
+		"type":               "block",
 	}
 }
 

explorer/standalone.go

@@ -2390,8 +2390,10 @@ func formatPlatformBlock(b map[string]any) map[string]any {
 		"parent_hash": parent, // SPA compatibility
 		"timestamp":   fmtTimestamp(b["timestamp"]),
 		"status":      platformStr(b["status"]),
-		"tx_count":    toInt64(b["tx_count"]),
-		"tx_ids":      parsePlatformTxIDs(b["tx_ids"]),
+		// Same name the EVM block carries — these rows go through the SPA's
+		// block widgets, which read `transactions_count`. See formatBlock.
+		"transactions_count": toInt64(b["tx_count"]),
+		"tx_ids":             parsePlatformTxIDs(b["tx_ids"]),
 	}
 }
 

explorer/standalone_api_test.go

@@ -463,7 +463,7 @@ func TestListBlocks_ResponseFields(t *testing.T) {
 	body := getJSON(t, ts, "/v1/explorer/blocks", 200)
 	got := itemMaps(t, body)
 	b := got[0]
-	for _, field := range []string{"height", "hash", "parent_hash", "miner", "gas_limit", "gas_used", "timestamp", "tx_count", "type"} {
+	for _, field := range []string{"height", "hash", "parent_hash", "miner", "gas_limit", "gas_used", "timestamp", "transactions_count", "type"} {
 		if _, ok := b[field]; !ok {
 			t.Errorf("missing field %q", field)
 		}
@@ -1778,7 +1778,7 @@ func TestBlockFieldValues(t *testing.T) {
 		{"gas_used", "1234567"},
 		{"base_fee_per_gas", "25000000000"},
 		{"size", float64(2048)},
-		{"tx_count", float64(3)},
+		{"transactions_count", float64(3)},
 		{"type", "block"},
 	}