feat: add shift-enter hint below chat composer

web/frontend/src/components/chat/chat-composer.tsx

@@ -70,6 +70,7 @@ export function ChatComposer({
   const { t } = useTranslation()
   const canInput = inputDisabledReason === null
   const composingRef = useRef(false)
+  const hasInput = input.trim().length > 0
   const disabledMessage =
     inputDisabledReason === null
       ? null
@@ -96,120 +97,134 @@ export function ChatComposer({
 
   return (
     <div className="before:bg-background pointer-events-none relative z-10 -mt-[24px] shrink-0 [scrollbar-gutter:stable] overflow-y-auto px-4 pb-[calc(1rem+env(safe-area-inset-bottom))] before:pointer-events-none before:absolute before:inset-x-0 before:top-[24px] before:bottom-0 before:content-[''] md:px-8 md:pb-8 lg:px-24 xl:px-48">
-      <div
-        className={cn(
-          "bg-card border-border/60 pointer-events-auto relative mx-auto flex max-w-[1000px] flex-col rounded-2xl border p-3 shadow-sm transition-colors",
-          isDragActive && "border-violet-400/70 bg-violet-500/5",
-        )}
-        onDragEnter={onDragEnter}
-        onDragLeave={onDragLeave}
-        onDragOver={onDragOver}
-        onDrop={onDrop}
-      >
-        {isDragActive && (
-          <div className="pointer-events-none absolute inset-0 z-10 flex items-center justify-center rounded-2xl border-2 border-dashed border-violet-400/70 bg-violet-500/10">
-            <div className="bg-background/95 text-foreground rounded-full px-4 py-2 text-sm font-medium shadow-sm">
-              {t("chat.dropImagesActive")}
+      <div className="pointer-events-auto mx-auto flex max-w-[1000px] flex-col items-end">
+        <div
+          className={cn(
+            "bg-card border-border/60 relative flex w-full flex-col rounded-2xl border p-3 shadow-sm transition-colors",
+            isDragActive && "border-violet-400/70 bg-violet-500/5",
+          )}
+          onDragEnter={onDragEnter}
+          onDragLeave={onDragLeave}
+          onDragOver={onDragOver}
+          onDrop={onDrop}
+        >
+          {isDragActive && (
+            <div className="pointer-events-none absolute inset-0 z-10 flex items-center justify-center rounded-2xl border-2 border-dashed border-violet-400/70 bg-violet-500/10">
+              <div className="bg-background/95 text-foreground rounded-full px-4 py-2 text-sm font-medium shadow-sm">
+                {t("chat.dropImagesActive")}
+              </div>
+            </div>
+          )}
+
+          {attachments.length > 0 && (
+            <div className="mb-3 flex flex-wrap gap-2 px-2">
+              {attachments.map((attachment, index) => (
+                <div
+                  key={`${attachment.url}-${index}`}
+                  className="bg-background relative h-20 w-20 overflow-hidden rounded-xl border"
+                >
+                  <img
+                    src={attachment.url}
+                    alt={attachment.filename || t("chat.uploadedImage")}
+                    className="h-full w-full object-cover"
+                  />
+                  <button
+                    type="button"
+                    onClick={() => onRemoveAttachment(index)}
+                    className="bg-background/85 text-foreground absolute top-1 right-1 inline-flex h-6 w-6 items-center justify-center rounded-full border shadow-sm transition hover:bg-white"
+                    aria-label={t("chat.removeImage")}
+                    title={t("chat.removeImage")}
+                  >
+                    <IconX className="h-3.5 w-3.5" />
+                  </button>
+                </div>
+              ))}
+            </div>
+          )}
+
+          <TextareaAutosize
+            value={input}
+            onChange={(e) => onInputChange(e.target.value)}
+            onCompositionStart={() => {
+              composingRef.current = true
+            }}
+            onCompositionEnd={() => {
+              composingRef.current = false
+            }}
+            onPaste={onPaste}
+            onKeyDown={handleKeyDown}
+            placeholder={placeholder}
+            disabled={!canInput}
+            title={disabledMessage || undefined}
+            className={cn(
+              "placeholder:text-muted-foreground/50 max-h-[200px] min-h-[64px] resize-none border-0 bg-transparent px-2 py-1 text-[15px] shadow-none transition-colors focus-visible:ring-0 focus-visible:outline-none dark:bg-transparent",
+              !canInput && "cursor-not-allowed",
+            )}
+            minRows={1}
+            maxRows={8}
+          />
+
+          <div className="mt-2 flex items-center justify-between px-1">
+            <div className="flex items-center gap-1">
+              <Button
+                type="button"
+                variant="ghost"
+                size="icon"
+                className="text-muted-foreground hover:text-foreground h-8 w-8 rounded-full"
+                onClick={onAddImages}
+                disabled={!canInput}
+                aria-label={t("chat.attachImage")}
+                title={t("chat.attachImage")}
+              >
+                <IconPhotoPlus className="size-4" />
+              </Button>
+            </div>
+
+            <div className="flex items-center gap-1.5">
+              {contextUsage && (
+                <ContextUsageRing
+                  usage={contextUsage}
+                  onDetailClick={onContextDetail}
+                />
+              )}
+              {canInput ? (
+                <Tooltip delayDuration={700}>
+                  <TooltipTrigger asChild>
+                    <span tabIndex={!canSend ? 0 : undefined}>
+                      <Button
+                        type="button"
+                        size="icon"
+                        className="size-8 rounded-full bg-violet-500 text-white transition-transform hover:bg-violet-600 active:scale-95"
+                        onClick={onSend}
+                        disabled={!canSend}
+                        aria-label={t("chat.sendMessage")}
+                      >
+                        <IconArrowUp className="size-4" />
+                      </Button>
+                    </span>
+                  </TooltipTrigger>
+                  <TooltipContent
+                    className="border-border/70 bg-muted text-foreground border text-center whitespace-pre-line shadow-lg shadow-black/10 dark:shadow-black/30"
+                    arrowClassName="bg-muted fill-muted"
+                  >
+                    {t("chat.sendHint")}
+                  </TooltipContent>
+                </Tooltip>
+              ) : null}
             </div>
           </div>
-        )}
+        </div>
 
-        {attachments.length > 0 && (
-          <div className="mb-3 flex flex-wrap gap-2 px-2">
-            {attachments.map((attachment, index) => (
-              <div
-                key={`${attachment.url}-${index}`}
-                className="bg-background relative h-20 w-20 overflow-hidden rounded-xl border"
-              >
-                <img
-                  src={attachment.url}
-                  alt={attachment.filename || t("chat.uploadedImage")}
-                  className="h-full w-full object-cover"
-                />
-                <button
-                  type="button"
-                  onClick={() => onRemoveAttachment(index)}
-                  className="bg-background/85 text-foreground absolute top-1 right-1 inline-flex h-6 w-6 items-center justify-center rounded-full border shadow-sm transition hover:bg-white"
-                  aria-label={t("chat.removeImage")}
-                  title={t("chat.removeImage")}
-                >
-                  <IconX className="h-3.5 w-3.5" />
-                </button>
-              </div>
-            ))}
-          </div>
-        )}
-
-        <TextareaAutosize
-          value={input}
-          onChange={(e) => onInputChange(e.target.value)}
-          onCompositionStart={() => {
-            composingRef.current = true
-          }}
-          onCompositionEnd={() => {
-            composingRef.current = false
-          }}
-          onPaste={onPaste}
-          onKeyDown={handleKeyDown}
-          placeholder={placeholder}
-          disabled={!canInput}
-          title={disabledMessage || undefined}
+        <div
+          aria-hidden={!hasInput}
           className={cn(
-            "placeholder:text-muted-foreground/50 max-h-[200px] min-h-[64px] resize-none border-0 bg-transparent px-2 py-1 text-[15px] shadow-none transition-colors focus-visible:ring-0 focus-visible:outline-none dark:bg-transparent",
-            !canInput && "cursor-not-allowed",
+            "border-border/70 bg-muted text-foreground mt-2 inline-flex items-center rounded-md border px-3 py-1.5 text-xs shadow-lg shadow-black/10 transition-all duration-200 dark:shadow-black/30",
+            hasInput
+              ? "translate-y-0 opacity-100"
+              : "pointer-events-none -translate-y-1 opacity-0",
           )}
-          minRows={1}
-          maxRows={8}
-        />
-
-        <div className="mt-2 flex items-center justify-between px-1">
-          <div className="flex items-center gap-1">
-            <Button
-              type="button"
-              variant="ghost"
-              size="icon"
-              className="text-muted-foreground hover:text-foreground h-8 w-8 rounded-full"
-              onClick={onAddImages}
-              disabled={!canInput}
-              aria-label={t("chat.attachImage")}
-              title={t("chat.attachImage")}
-            >
-              <IconPhotoPlus className="size-4" />
-            </Button>
-          </div>
-
-          <div className="flex items-center gap-1.5">
-            {contextUsage && (
-              <ContextUsageRing
-                usage={contextUsage}
-                onDetailClick={onContextDetail}
-              />
-            )}
-            {canInput ? (
-              <Tooltip delayDuration={700}>
-                <TooltipTrigger asChild>
-                  <span tabIndex={!canSend ? 0 : undefined}>
-                    <Button
-                      type="button"
-                      size="icon"
-                      className="size-8 rounded-full bg-violet-500 text-white transition-transform hover:bg-violet-600 active:scale-95"
-                      onClick={onSend}
-                      disabled={!canSend}
-                      aria-label={t("chat.sendMessage")}
-                    >
-                      <IconArrowUp className="size-4" />
-                    </Button>
-                  </span>
-                </TooltipTrigger>
-                <TooltipContent
-                  className="border-border/70 bg-muted text-foreground border text-center whitespace-pre-line shadow-lg shadow-black/10 dark:shadow-black/30"
-                  arrowClassName="bg-muted fill-muted"
-                >
-                  {t("chat.sendHint")}
-                </TooltipContent>
-              </Tooltip>
-            ) : null}
-          </div>
+        >
+          {t("chat.composeHint")}
         </div>
       </div>
     </div>

web/frontend/src/i18n/locales/bn-in.json

@@ -94,6 +94,7 @@
     },
     "sendMessage": "বার্তা পাঠান",
     "sendHint": "পাঠাতে Enter চাপুন\nনতুন লাইনের জন্য Shift + Enter",
+    "composeHint": "পাঠাতে Enter চাপুন, নতুন লাইনের জন্য Shift + Enter",
     "contextTitle": "প্রসঙ্গ",
     "contextDetail": "বিস্তারিত দেখুন",
     "contextCompressAt": "Compress at",

web/frontend/src/i18n/locales/cs.json

@@ -92,6 +92,7 @@
     },
     "sendMessage": "Odeslat zprávu",
     "sendHint": "Enter pro odeslání\nShift + Enter pro nový řádek",
+    "composeHint": "Enter pro odeslání, Shift + Enter pro nový řádek",
     "contextTitle": "Kontext",
     "contextDetail": "Zobrazit detail",
     "contextCompressAt": "Komprimovat při",

web/frontend/src/i18n/locales/en.json

@@ -94,6 +94,7 @@
     },
     "sendMessage": "Send message",
     "sendHint": "Press Enter to send\nShift + Enter for a new line",
+    "composeHint": "Press Enter to send, Shift + Enter for a new line",
     "contextTitle": "Context",
     "contextDetail": "View Details",
     "contextCompressAt": "Compress at",

web/frontend/src/i18n/locales/pt-br.json

@@ -94,6 +94,7 @@
     },
     "sendMessage": "Enviar mensagem",
     "sendHint": "Pressione Enter para enviar\nShift + Enter para nova linha",
+    "composeHint": "Pressione Enter para enviar, Shift + Enter para nova linha",
     "contextTitle": "Contexto",
     "contextDetail": "Ver Detalhes",
     "contextCompressAt": "Comprimir em",

web/frontend/src/i18n/locales/zh.json

@@ -94,6 +94,7 @@
     },
     "sendMessage": "发送消息",
     "sendHint": "按 Enter 发送\nShift + Enter 换行",
+    "composeHint": "按 Enter 发送，Shift + Enter 换行",
     "contextTitle": "上下文",
     "contextDetail": "查看详情",
     "contextCompressAt": "压缩阈值",