fix(ui): separate prompt composer action columns

Keep the textarea width independent from the prompt controls so wrapping matches the visible layout. Split secondary controls from the primary stop/send rail to preserve the original action column width and add a matching divider.

packages/ui/src/components/prompt-input.tsx

@@ -581,113 +581,6 @@ export default function PromptInput(props: PromptInputProps) {
                 autoCapitalize="off"
                 autocomplete="off"
               />
-              <div class="prompt-nav-buttons">
-                <div class="prompt-nav-column prompt-nav-column-left">
-                  <Show when={showVoiceInput()}>
-                    <button
-                      type="button"
-                      class={`prompt-voice-button prompt-nav-voice-button ${voiceInput.isRecording() ? "is-recording" : ""}`}
-                      onPointerDown={(event) => {
-                        event.preventDefault()
-                        beginVoicePress(event)
-                      }}
-                      onPointerUp={(event) => {
-                        event.preventDefault()
-                        endVoicePress()
-                      }}
-                      onPointerCancel={() => endVoicePress()}
-                      onLostPointerCapture={() => endVoicePress()}
-                      onKeyDown={(event) => {
-                        if (event.repeat) return
-                        if (event.key !== " " && event.key !== "Enter") return
-                        event.preventDefault()
-                        beginVoicePress(event)
-                      }}
-                      onKeyUp={(event) => {
-                        if (event.key !== " " && event.key !== "Enter") return
-                        event.preventDefault()
-                        endVoicePress()
-                      }}
-                      onBlur={() => endVoicePress()}
-                      disabled={!voiceInput.isRecording() && (props.disabled || voiceInput.isTranscribing() || !voiceInput.canUseVoiceInput())}
-                      aria-label={voiceInput.buttonTitle()}
-                      title={voiceInput.buttonTitle()}
-                    >
-                      <Show
-                        when={voiceInput.isRecording()}
-                        fallback={
-                          <Show when={voiceInput.isTranscribing()} fallback={<Mic class="h-4 w-4" aria-hidden="true" />}>
-                            <Loader2 class="h-4 w-4 animate-spin" aria-hidden="true" />
-                          </Show>
-                        }
-                      >
-                        <Mic class="h-4 w-4" aria-hidden="true" />
-                      </Show>
-                    </button>
-                  </Show>
-                  <Show when={showConversationToggle()}>
-                    <button
-                      type="button"
-                      class={`prompt-voice-button prompt-nav-voice-button prompt-conversation-button ${conversationModeEnabled() ? "is-active" : ""}`}
-                      onClick={() => toggleConversationMode(props.instanceId)}
-                      disabled={!conversationModeEnabled() && !canToggleConversationMode()}
-                      aria-pressed={conversationModeEnabled()}
-                      aria-label={conversationModeButtonTitle()}
-                      title={conversationModeButtonTitle()}
-                    >
-                      <Volume2 class="h-4 w-4" aria-hidden="true" />
-                    </button>
-                  </Show>
-                  <button
-                    type="button"
-                    class="prompt-clear-button"
-                    onClick={handleClearPrompt}
-                    disabled={!canClearPrompt()}
-                    aria-label={t("promptInput.clear.ariaLabel")}
-                    title={t("promptInput.clear.title")}
-                  >
-                    <X class="h-4 w-4" aria-hidden="true" />
-                  </button>
-                </div>
-                <div class="prompt-nav-column prompt-nav-column-right">
-                  <ExpandButton
-                    expandState={expandState}
-                    onToggleExpand={handleExpandToggle}
-                  />
-                  <Show when={hasHistory()}>
-                    <button
-                      type="button"
-                      class="prompt-history-button"
-                      onClick={() =>
-                        selectPreviousHistory({
-                          force: true,
-                          isPickerOpen: showPicker(),
-                          getTextarea: () => textareaRef,
-                        })
-                      }
-                      disabled={!canHistoryGoPrevious()}
-                      aria-label={t("promptInput.history.previousAriaLabel")}
-                    >
-                      <ArrowBigUp class="h-5 w-5" aria-hidden="true" />
-                    </button>
-                    <button
-                      type="button"
-                      class="prompt-history-button"
-                      onClick={() =>
-                        selectNextHistory({
-                          force: true,
-                          isPickerOpen: showPicker(),
-                          getTextarea: () => textareaRef,
-                        })
-                      }
-                      disabled={!canHistoryGoNext()}
-                      aria-label={t("promptInput.history.nextAriaLabel")}
-                    >
-                      <ArrowBigDown class="h-5 w-5" aria-hidden="true" />
-                    </button>
-                  </Show>
-                </div>
-              </div>
               <Show when={shouldShowOverlay()}>
                 <div class={`prompt-input-overlay keyboard-hints ${mode() === "shell" ? "shell-mode" : ""}`}>
                   <Show
@@ -742,6 +635,116 @@ export default function PromptInput(props: PromptInputProps) {
         </div>
 
         <div class="prompt-input-actions">
+          <div class="prompt-nav-buttons">
+            <div class="prompt-nav-column prompt-nav-column-left">
+              <Show when={showVoiceInput()}>
+                <button
+                  type="button"
+                  class={`prompt-voice-button prompt-nav-voice-button ${voiceInput.isRecording() ? "is-recording" : ""}`}
+                  onPointerDown={(event) => {
+                    event.preventDefault()
+                    beginVoicePress(event)
+                  }}
+                  onPointerUp={(event) => {
+                    event.preventDefault()
+                    endVoicePress()
+                  }}
+                  onPointerCancel={() => endVoicePress()}
+                  onLostPointerCapture={() => endVoicePress()}
+                  onKeyDown={(event) => {
+                    if (event.repeat) return
+                    if (event.key !== " " && event.key !== "Enter") return
+                    event.preventDefault()
+                    beginVoicePress(event)
+                  }}
+                  onKeyUp={(event) => {
+                    if (event.key !== " " && event.key !== "Enter") return
+                    event.preventDefault()
+                    endVoicePress()
+                  }}
+                  onBlur={() => endVoicePress()}
+                  disabled={!voiceInput.isRecording() && (props.disabled || voiceInput.isTranscribing() || !voiceInput.canUseVoiceInput())}
+                  aria-label={voiceInput.buttonTitle()}
+                  title={voiceInput.buttonTitle()}
+                >
+                  <Show
+                    when={voiceInput.isRecording()}
+                    fallback={
+                      <Show when={voiceInput.isTranscribing()} fallback={<Mic class="h-4 w-4" aria-hidden="true" />}>
+                        <Loader2 class="h-4 w-4 animate-spin" aria-hidden="true" />
+                      </Show>
+                    }
+                  >
+                    <Mic class="h-4 w-4" aria-hidden="true" />
+                  </Show>
+                </button>
+              </Show>
+              <Show when={showConversationToggle()}>
+                <button
+                  type="button"
+                  class={`prompt-voice-button prompt-nav-voice-button prompt-conversation-button ${conversationModeEnabled() ? "is-active" : ""}`}
+                  onClick={() => toggleConversationMode(props.instanceId)}
+                  disabled={!conversationModeEnabled() && !canToggleConversationMode()}
+                  aria-pressed={conversationModeEnabled()}
+                  aria-label={conversationModeButtonTitle()}
+                  title={conversationModeButtonTitle()}
+                >
+                  <Volume2 class="h-4 w-4" aria-hidden="true" />
+                </button>
+              </Show>
+              <button
+                type="button"
+                class="prompt-clear-button"
+                onClick={handleClearPrompt}
+                disabled={!canClearPrompt()}
+                aria-label={t("promptInput.clear.ariaLabel")}
+                title={t("promptInput.clear.title")}
+              >
+                <X class="h-4 w-4" aria-hidden="true" />
+              </button>
+            </div>
+            <div class="prompt-nav-column prompt-nav-column-right">
+              <ExpandButton
+                expandState={expandState}
+                onToggleExpand={handleExpandToggle}
+              />
+              <Show when={hasHistory()}>
+                <button
+                  type="button"
+                  class="prompt-history-button"
+                  onClick={() =>
+                    selectPreviousHistory({
+                      force: true,
+                      isPickerOpen: showPicker(),
+                      getTextarea: () => textareaRef,
+                    })
+                  }
+                  disabled={!canHistoryGoPrevious()}
+                  aria-label={t("promptInput.history.previousAriaLabel")}
+                >
+                  <ArrowBigUp class="h-5 w-5" aria-hidden="true" />
+                </button>
+                <button
+                  type="button"
+                  class="prompt-history-button"
+                  onClick={() =>
+                    selectNextHistory({
+                      force: true,
+                      isPickerOpen: showPicker(),
+                      getTextarea: () => textareaRef,
+                    })
+                  }
+                  disabled={!canHistoryGoNext()}
+                  aria-label={t("promptInput.history.nextAriaLabel")}
+                >
+                  <ArrowBigDown class="h-5 w-5" aria-hidden="true" />
+                </button>
+              </Show>
+            </div>
+          </div>
+        </div>
+
+        <div class="prompt-input-primary-actions">
           <button
             type="button"
             class="stop-button"

packages/ui/src/styles/messaging/prompt-input.css

@@ -6,7 +6,7 @@
 
 .prompt-input-wrapper {
   @apply grid items-stretch;
-  grid-template-columns: minmax(0, 1fr) 64px;
+  grid-template-columns: minmax(0, 1fr) 72px 64px;
   gap: 0;
   padding: 0;
 }
@@ -19,6 +19,16 @@
   gap: 0.5rem;
 }
 
+.prompt-input-primary-actions {
+  @apply flex flex-col items-center;
+  align-self: stretch;
+  justify-content: space-between;
+  width: 100%;
+  gap: 0.5rem;
+  padding: 0.5rem 0.25rem;
+  border-inline-start: 1px solid var(--border-base);
+}
+
 .prompt-input-field-container {
   position: relative;
   width: 100%;
@@ -37,7 +47,7 @@
 .prompt-input {
   @apply w-full pt-2.5 border text-sm resize-none outline-none transition-colors;
   padding-inline-start: 0.75rem;
-  padding-inline-end: 7.5rem;
+  padding-inline-end: 0.75rem;
   font-family: inherit;
   background-color: var(--surface-base);
   color: var(--text-primary);
@@ -85,16 +95,12 @@
 
 /* Navigation buttons container (expand, prev, next). */
 .prompt-nav-buttons {
-  position: absolute;
-  top: 0.25rem;
-  inset-inline-end: 0.25rem;
-  bottom: 0.25rem;
   display: flex;
   flex-direction: row;
   align-items: flex-start;
-  justify-content: flex-end;
+  justify-content: center;
   gap: 0.125rem;
-  z-index: 2;
+  width: 100%;
 }
 
 .prompt-nav-column {
@@ -287,7 +293,6 @@
   @apply w-10 h-10 rounded-md border-none cursor-pointer flex items-center justify-center transition-all flex-shrink-0;
   background-color: var(--accent-primary);
   color: var(--text-inverted);
-  margin-top: auto;
 }
 
 .send-button.shell-mode {
@@ -421,7 +426,7 @@
 
 @media (max-width: 720px) {
   .prompt-input-wrapper {
-    grid-template-columns: minmax(0, 1fr) 40px;
+    grid-template-columns: minmax(0, 1fr) 64px 40px;
   }
 }
 
@@ -429,7 +434,6 @@
   .prompt-input {
     min-height: 0;
     padding: 0.5rem 0.75rem;
-    padding-inline-end: 7.5rem;
     padding-bottom: 0.75rem;
   }