feat(msgviewer): re-enable composite renderer with scroll support and inline images

Composite mode now handles j/k/g/G/PgUp/PgDown/mouse wheel for scrolling.
Text uses the configured default style. Images render inline via Vaxis.
Emails without images still use the standard pager path.

app/compositeview.go

@@ -186,13 +186,16 @@ func (cc *compositeContent) CleanupFiles() {
 }
 
 // Draw renders the composite content into the given UI context.
-// scroll is the row offset from the top.
-func (cc *compositeContent) Draw(ctx *ui.Context, scroll int) {
+// scroll is the row offset from the top. style is the default text style.
+func (cc *compositeContent) Draw(ctx *ui.Context, scroll int, style ...vaxis.Style) {
 	width := ctx.Width()
 	height := ctx.Height()
 	row := -scroll // start above viewport if scrolled
 
 	defaultStyle := vaxis.Style{}
+	if len(style) > 0 {
+		defaultStyle = style[0]
+	}
 
 	for _, b := range cc.blocks {
 		switch b.blockType {

app/msgviewer.go

@@ -632,19 +632,19 @@ func (pv *PartViewer) attemptCopy() {
 			}
 			// Extract image markers from filter output
 			cleaned, images := parse.ExtractImages(&filterBuf)
+			cleanedBytes, _ := io.ReadAll(cleaned)
 			if len(images) > 0 {
 				pv.imageRefs = images
-				log.Debugf("extracted %d image refs from filter output", len(images))
-			}
-			// Always forward to pager — placeholders are readable text
-			// Image markers become \x00IMG:N\x00 which we replace
-			// with human-readable [image: alt] text for the pager.
-			cleanedBytes, _ := io.ReadAll(cleaned)
-			output := parse.ReplacePlaceholders(cleanedBytes, images)
-			_, copyErr := io.Copy(pv.pagerin, bytes.NewReader(output))
+				pv.composite = newCompositeContent(
+					string(cleanedBytes), images, 80)
+				pv.Invalidate()
+			} else {
+				// No images — forward to pager as normal
+				_, copyErr := io.Copy(pv.pagerin, bytes.NewReader(cleanedBytes))
 				if copyErr != nil {
 					log.Errorf("io.Copy: %s", copyErr)
 				}
+			}
 			err = pv.pagerin.Close()
 			if err != nil {
 				log.Errorf("error closing pager pipe: %v", err)
@@ -838,9 +838,14 @@ func (pv *PartViewer) Draw(ctx *ui.Context) {
 	if pv.term != nil {
 		pv.term.Draw(ctx)
 	}
-	// NOTE: Composite image rendering (pv.composite) is reserved for
-	// future use. Currently all filter output goes through the pager
-	// with [image: alt] text placeholders for extracted images.
+	// Composite mode: text + inline images from filter output
+	if pv.composite != nil {
+		pv.composite.width = ctx.Width()
+		style := pv.uiConfig.GetStyle(config.STYLE_DEFAULT)
+		ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style)
+		pv.composite.Draw(ctx, pv.scroll, style)
+		return
+	}
 	if pv.image != nil && (pv.resized(ctx) || pv.graphic == nil) {
 		// This path should only occur on resizes or the first pass
 		// after the image is downloaded and could be slow due to
@@ -890,12 +895,69 @@ func (pv *PartViewer) resized(ctx *ui.Context) bool {
 }
 
 func (pv *PartViewer) Event(event vaxis.Event) bool {
+	if pv.composite != nil {
+		switch ev := event.(type) {
+		case vaxis.Mouse:
+			switch ev.Button {
+			case vaxis.MouseWheelUp:
+				pv.scrollComposite(-3)
+				return true
+			case vaxis.MouseWheelDown:
+				pv.scrollComposite(3)
+				return true
+			}
+		case vaxis.Key:
+			switch {
+			case ev.Matches('j'), ev.Matches(vaxis.KeyDown):
+				pv.scrollComposite(1)
+				return true
+			case ev.Matches('k'), ev.Matches(vaxis.KeyUp):
+				pv.scrollComposite(-1)
+				return true
+			case ev.Matches(vaxis.KeyPgDown), ev.Matches(' '):
+				pv.scrollComposite(pv.height / 2)
+				return true
+			case ev.Matches(vaxis.KeyPgUp):
+				pv.scrollComposite(-pv.height / 2)
+				return true
+			case ev.Matches('g'), ev.Matches(vaxis.KeyHome):
+				pv.scroll = 0
+				pv.Invalidate()
+				return true
+			case ev.Matches('G'), ev.Matches(vaxis.KeyEnd):
+				maxScroll := pv.composite.totalHeight() - pv.height
+				if maxScroll > 0 {
+					pv.scroll = maxScroll
+				}
+				pv.Invalidate()
+				return true
+			}
+		}
+		return false
+	}
 	if pv.term != nil {
 		return pv.term.Event(event)
 	}
 	return false
 }
 
+func (pv *PartViewer) scrollComposite(delta int) {
+	pv.scroll += delta
+	if pv.scroll < 0 {
+		pv.scroll = 0
+	}
+	if pv.composite != nil {
+		maxScroll := pv.composite.totalHeight() - pv.height
+		if maxScroll < 0 {
+			maxScroll = 0
+		}
+		if pv.scroll > maxScroll {
+			pv.scroll = maxScroll
+		}
+	}
+	pv.Invalidate()
+}
+
 type HeaderView struct {
 	Name       string
 	Value      string