Apply dirty tracking to Drafts button prompt

Only show the save/discard prompt when pressing the Drafts button if
the composer has unsaved changes (isDirty). If the content is unchanged
from a loaded draft or was just saved, go directly to the drafts list.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/view/com/composer/Composer.tsx

@@ -832,7 +832,8 @@ export const ComposePost = ({
             onSelectDraft={handleSelectDraft}
             onSaveDraft={saveCurrentDraft}
             onDiscard={handleClearComposer}
-            isEmpty={isComposerEmpty}>
+            isEmpty={isComposerEmpty}
+            isDirty={composerState.isDirty}>
             {missingAltError && <AltTextReminder error={missingAltError} />}
             <ErrorBanner
               error={error}
@@ -1124,6 +1125,7 @@ function ComposerTopBar({
   onSaveDraft,
   onDiscard,
   isEmpty,
+  isDirty,
   topBarAnimatedStyle,
   children,
 }: {
@@ -1139,6 +1141,7 @@ function ComposerTopBar({
   onSaveDraft: () => Promise<void>
   onDiscard: () => void
   isEmpty: boolean
+  isDirty: boolean
   topBarAnimatedStyle: StyleProp<ViewStyle>
   children?: React.ReactNode
 }) {
@@ -1170,6 +1173,7 @@ function ComposerTopBar({
           onSaveDraft={onSaveDraft}
           onDiscard={onDiscard}
           isEmpty={isEmpty}
+          isDirty={isDirty}
         />
         {isPublishing ? (
           <>

src/view/com/composer/drafts/DraftsButton.tsx

@@ -13,11 +13,13 @@ export function DraftsButton({
   onSaveDraft,
   onDiscard,
   isEmpty,
+  isDirty,
 }: {
   onSelectDraft: (draft: StoredDraft) => void
   onSaveDraft: () => Promise<void>
   onDiscard: () => void
   isEmpty: boolean
+  isDirty: boolean
 }) {
   const {_} = useLingui()
   const draftsDialogControl = Dialog.useDialogControl()
@@ -25,11 +27,11 @@ export function DraftsButton({
   const {isPending: isSaving} = useSaveDraft()
 
   const handlePress = () => {
-    if (isEmpty) {
-      // Composer is empty, go directly to drafts list
+    if (isEmpty || !isDirty) {
+      // Composer is empty or has no unsaved changes, go directly to drafts list
       draftsDialogControl.open()
     } else {
-      // Composer has content, ask what to do
+      // Composer has unsaved changes, ask what to do
       savePromptControl.open()
     }
   }