fix(order): surface rejection reason, keep sync green, hydrate verdicts

Three issues surfaced once the per-command rejection from the previous
commit actually reached the UI:

1. Sync banner falsely red. `OrderDraftStore.runSync` flipped
   `syncStatus = "error"` whenever any command was rejected and
   advertised a Retry button. A per-command rejection is a
   player-correctable state — the round trip succeeded, the engine
   just refused that command — so the retry can't help. Keep
   `syncStatus = "synced"` on `success`; the red row highlight is
   the visible cue.

2. Rejection reason missing. Add `cmd_error_message: string` to
   `CommandItem` in `pkg/schema/fbs/order.fbs` (appended last to
   preserve existing slot offsets) and regenerate the Go + TS stubs
   for that one type. Plumb the message through `CommandMeta`,
   `Controller.applyCommand`'s `m.Result(code, message)` call, the
   Go transcoder, the UI decoders in `submit.ts` /  `order-load.ts`,
   and the `OrderDraftStore.errorMessages` map. `order-tab.svelte`
   renders it as an italic danger-coloured line under rejected
   commands, with new CSS for `.error-reason`.

3. Verdict lost on navigation. `order-load.ts.decodeCommand` never
   read `cmdApplied`/`cmdErrorCode`, so `hydrateFromServer` fell
   back to a blanket "applied" status — a previously-rejected
   command came back green after a lobby → game round trip. Extend
   the fetch decoder to populate `statuses`/`errorCodes`/
   `errorMessages` maps and have `hydrateFromServer` use them.
   Engine-side persistence already records the verdict on disk —
   verified against the live `0000/order/<id>.json`.

`flatbuffers@25` elides default-int8/int64 fields on write; the Go
transcoder force-slots `cmd_applied=false` / `cmd_error_code=0`
already, the new test fixtures flip `builder.forceDefaults(true)` to
mirror that behaviour so the round trip survives.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/frontend/src/proto/galaxy/fbs/order/command-item.ts

@@ -75,8 +75,15 @@ payload<T extends flatbuffers.Table>(obj:any):any|null {
   return offset ? this.bb!.__union(obj, this.bb_pos + offset) : null;
 }
 
+cmdErrorMessage():string|null
+cmdErrorMessage(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+cmdErrorMessage(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 14);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
 static startCommandItem(builder:flatbuffers.Builder) {
-  builder.startObject(5);
+  builder.startObject(6);
 }
 
 static addCmdId(builder:flatbuffers.Builder, cmdIdOffset:flatbuffers.Offset) {
@@ -84,11 +91,11 @@ static addCmdId(builder:flatbuffers.Builder, cmdIdOffset:flatbuffers.Offset) {
 }
 
 static addCmdApplied(builder:flatbuffers.Builder, cmdApplied:boolean) {
-  builder.addFieldInt8(1, +cmdApplied, null);
+  builder.addFieldInt8(1, +cmdApplied, 0);
 }
 
 static addCmdErrorCode(builder:flatbuffers.Builder, cmdErrorCode:bigint) {
-  builder.addFieldInt64(2, cmdErrorCode, null);
+  builder.addFieldInt64(2, cmdErrorCode, BigInt(0));
 }
 
 static addPayloadType(builder:flatbuffers.Builder, payloadType:CommandPayload) {
@@ -99,13 +106,17 @@ static addPayload(builder:flatbuffers.Builder, payloadOffset:flatbuffers.Offset)
   builder.addFieldOffset(4, payloadOffset, 0);
 }
 
+static addCmdErrorMessage(builder:flatbuffers.Builder, cmdErrorMessageOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(5, cmdErrorMessageOffset, 0);
+}
+
 static endCommandItem(builder:flatbuffers.Builder):flatbuffers.Offset {
   const offset = builder.endObject();
   builder.requiredField(offset, 12) // payload
   return offset;
 }
 
-static createCommandItem(builder:flatbuffers.Builder, cmdIdOffset:flatbuffers.Offset, cmdApplied:boolean|null, cmdErrorCode:bigint|null, payloadType:CommandPayload, payloadOffset:flatbuffers.Offset):flatbuffers.Offset {
+static createCommandItem(builder:flatbuffers.Builder, cmdIdOffset:flatbuffers.Offset, cmdApplied:boolean|null, cmdErrorCode:bigint|null, payloadType:CommandPayload, payloadOffset:flatbuffers.Offset, cmdErrorMessageOffset:flatbuffers.Offset):flatbuffers.Offset {
   CommandItem.startCommandItem(builder);
   CommandItem.addCmdId(builder, cmdIdOffset);
   if (cmdApplied !== null)
@@ -114,6 +125,7 @@ static createCommandItem(builder:flatbuffers.Builder, cmdIdOffset:flatbuffers.Of
     CommandItem.addCmdErrorCode(builder, cmdErrorCode);
   CommandItem.addPayloadType(builder, payloadType);
   CommandItem.addPayload(builder, payloadOffset);
+  CommandItem.addCmdErrorMessage(builder, cmdErrorMessageOffset);
   return CommandItem.endCommandItem(builder);
 }
 
@@ -127,7 +139,8 @@ unpack(): CommandItemT {
       const temp = unionToCommandPayload(this.payloadType(), this.payload.bind(this));
       if(temp === null) { return null; }
       return temp.unpack()
-  })()
+  })(),
+    this.cmdErrorMessage()
   );
 }
 
@@ -142,6 +155,7 @@ unpackTo(_o: CommandItemT): void {
       if(temp === null) { return null; }
       return temp.unpack()
   })();
+  _o.cmdErrorMessage = this.cmdErrorMessage();
 }
 }
 
@@ -151,20 +165,23 @@ constructor(
   public cmdApplied: boolean|null = null,
   public cmdErrorCode: bigint|null = null,
   public payloadType: CommandPayload = CommandPayload.NONE,
-  public payload: CommandFleetMergeT|CommandFleetSendT|CommandPlanetProduceT|CommandPlanetRenameT|CommandPlanetRouteRemoveT|CommandPlanetRouteSetT|CommandRaceQuitT|CommandRaceRelationT|CommandRaceVoteT|CommandScienceCreateT|CommandScienceRemoveT|CommandShipClassCreateT|CommandShipClassMergeT|CommandShipClassRemoveT|CommandShipGroupBreakT|CommandShipGroupDismantleT|CommandShipGroupJoinFleetT|CommandShipGroupLoadT|CommandShipGroupMergeT|CommandShipGroupSendT|CommandShipGroupTransferT|CommandShipGroupUnloadT|CommandShipGroupUpgradeT|null = null
+  public payload: CommandFleetMergeT|CommandFleetSendT|CommandPlanetProduceT|CommandPlanetRenameT|CommandPlanetRouteRemoveT|CommandPlanetRouteSetT|CommandRaceQuitT|CommandRaceRelationT|CommandRaceVoteT|CommandScienceCreateT|CommandScienceRemoveT|CommandShipClassCreateT|CommandShipClassMergeT|CommandShipClassRemoveT|CommandShipGroupBreakT|CommandShipGroupDismantleT|CommandShipGroupJoinFleetT|CommandShipGroupLoadT|CommandShipGroupMergeT|CommandShipGroupSendT|CommandShipGroupTransferT|CommandShipGroupUnloadT|CommandShipGroupUpgradeT|null = null,
+  public cmdErrorMessage: string|Uint8Array|null = null
 ){}
 
 
 pack(builder:flatbuffers.Builder): flatbuffers.Offset {
   const cmdId = (this.cmdId !== null ? builder.createString(this.cmdId!) : 0);
   const payload = builder.createObjectOffset(this.payload);
+  const cmdErrorMessage = (this.cmdErrorMessage !== null ? builder.createString(this.cmdErrorMessage!) : 0);
 
   return CommandItem.createCommandItem(builder,
     cmdId,
     this.cmdApplied,
     this.cmdErrorCode,
     this.payloadType,
-    payload
+    payload,
+    cmdErrorMessage
   );
 }
 }