chore(chat): clean up legacy state machine and fix bubble alignment

- Remove redundant `loadingMoreHistory` and `ready` states from chat machine, consolidating history loading flow
- Add `align-self: flex-start` to chat row container for proper alignment
- Clean up commented-out margin rules in text bubble styles
- Update deploy script GIT_REMOTE from "server" to "test"

src/stores/chat/chat-machine.ts

@@ -220,18 +220,6 @@ export const chatMachine = setup({
       on: {
         ChatGuestLogin: "#chat.guestSession",
         ChatNonGuestLogin: "#chat.userSession",
-        ChatLoadMoreHistory: {
-          actions: [
-            "logLoadMoreHistoryReceived",
-            ({ context }) =>
-              console.log("[chat-machine] idle.ChatLoadMoreHistory received (but no UI dispatcher)", {
-                currentOffset: context.historyOffset,
-                hasMore: context.hasMore,
-                isLoadingMore: context.isLoadingMore,
-              }),
-          ],
-          target: "loadingMoreHistory",
-        },
       },
     },
 
@@ -522,72 +510,6 @@ export const chatMachine = setup({
         },
       },
     },
-
-    loadingMoreHistory: {
-      entry: ({ context }) =>
-        console.log("[chat-machine] → loadingMoreHistory (legacy)", { offset: context.historyOffset }),
-      invoke: {
-        src: "loadMoreHistory",
-        input: ({ context }) => ({ offset: context.historyOffset }),
-        onDone: {
-          target: "ready",
-          actions: [
-            assign(({ context, event }) => ({
-              messages: [...event.output.messages, ...context.messages],
-              isLoadingMore: false,
-              hasMore: event.output.hasMore,
-              historyOffset: event.output.newOffset,
-            })),
-            ({ event }) =>
-              console.log("[chat-machine] loadingMoreHistory.onDone", {
-                newMessagesCount: event.output.messages.length,
-                newOffset: event.output.newOffset,
-                hasMore: event.output.hasMore,
-              }),
-          ],
-        },
-        onError: {
-          target: "ready",
-          actions: [
-            assign({ isLoadingMore: false }),
-            ({ event }) =>
-              console.error("[chat-machine] loadingMoreHistory.onError", {
-                error: event.error instanceof Error ? event.error.message : String(event.error),
-              }),
-          ],
-        },
-      },
-    },
-
-    ready: {
-      on: {
-        ChatSendMessage: {
-          actions: ["logSendMessageReceived", "appendUserMessage"],
-          guard: ({ event }) => event.content.trim().length > 0,
-        },
-        ChatSendImage: {
-          actions: ["logSendImageReceived", "appendUserImage"],
-        },
-        ChatLoadMoreHistory: {
-          actions: [
-            "logLoadMoreHistoryReceived",
-            ({ context }) =>
-              console.log("[chat-machine] ready.ChatLoadMoreHistory received (legacy ready)", {
-                currentOffset: context.historyOffset,
-                hasMore: context.hasMore,
-              }),
-          ],
-          target: "loadingMoreHistory",
-        },
-        ChatLogout: "#chat.idle",
-        ChatGuestLogin: "#chat.guestSession",
-        ChatNonGuestLogin: "#chat.userSession",
-        ChatAISentenceReceived: { actions: "appendOrUpdateAISentence" },
-        ChatWebSocketError: { actions: "appendSocketErrorMessage" },
-        ChatWebSocketConnected: { actions: "setWsConnected" },
-        ChatQuotaExceeded: { actions: "incrementQuotaExceeded" },
-      },
-    },
   },
 });