From 24dff6929dce6ed4a90f53e65dbd80df5f014e83 Mon Sep 17 00:00:00 2001
From: David Hill <1879069+iamdavidhill@users.noreply.github.com>
Date: Tue, 15 Sep 2026 16:19:41 -0600
Subject: [PATCH] feat(app): preview timeline images in attachment overlay
 (#49111)

---
 .../component-tests/markdown.fixture.tsx      |  5 +-
 .../component-tests/markdown.spec.ts          | 27 +++++----
 .../component-tests/read-image.fixture.tsx    | 59 ++++++++++---------
 .../component-tests/read-image.spec.ts        |  6 +-
 .../src/components/image-preview.tsx          | 31 ++++++++++
 .../session-ui/src/components/markdown.css    |  1 +
 .../session-ui/src/components/markdown.tsx    |  3 +
 .../src/components/message-part.css           |  1 +
 .../session-ui/src/tools/tool-renderer.tsx    |  3 +
 9 files changed, 93 insertions(+), 43 deletions(-)
 create mode 100644 packages/session-ui/src/components/image-preview.tsx

diff --git a/packages/session-ui/component-tests/markdown.fixture.tsx b/packages/session-ui/component-tests/markdown.fixture.tsx
index c47474aaa709..bb3f5a2f48fd 100644
--- a/packages/session-ui/component-tests/markdown.fixture.tsx
+++ b/packages/session-ui/component-tests/markdown.fixture.tsx
@@ -1,5 +1,6 @@
 import { createSignal, Show } from "solid-js"
 import { render } from "solid-js/web"
+import { DialogProvider } from "@opencode/ui/context/dialog"
 import { Markdown } from "../src/components/markdown"
 import { preloadMarkdown } from "../src/components/markdown-cache"
 import { MarkdownProvider } from "../src/context/markdown"
@@ -35,7 +36,7 @@ export async function mountMarkdown(options: {
     const [streaming, setStreaming] = createSignal(options.streaming ?? false)
     const [visible, setVisible] = createSignal(true)
     return (
-      <>
+      <DialogProvider>
         <textarea aria-label="Markdown text" value={text()} onInput={(event) => setText(event.currentTarget.value)} />
         <input
           aria-label="Streaming"
@@ -58,7 +59,7 @@ export async function mountMarkdown(options: {
             />
           </Show>
         </MarkdownProvider>
-      </>
+      </DialogProvider>
     )
   }, host)
 }
diff --git a/packages/session-ui/component-tests/markdown.spec.ts b/packages/session-ui/component-tests/markdown.spec.ts
index 3619e4351cd9..dab557031a76 100644
--- a/packages/session-ui/component-tests/markdown.spec.ts
+++ b/packages/session-ui/component-tests/markdown.spec.ts
@@ -545,9 +545,9 @@ for (const streaming of [false, true]) {
         { fixture, streaming },
       )
       const harness = page.getByTestId("markdown-fixture")
-      const image = harness.getByRole("img", { name: "Chart", exact: true })
+      const image = harness.getByRole("button", { name: "Chart", exact: true })
       await expect.poll(() => image.evaluate((image: HTMLImageElement) => image.naturalWidth)).toBe(1)
-      await expect(harness.getByRole("img", { name: "Again", exact: true })).toHaveAttribute("src", /^blob:/)
+      await expect(harness.getByRole("button", { name: "Again", exact: true })).toHaveAttribute("src", /^blob:/)
       expect(requests).toHaveLength(1)
       expect(new URL(requests[0]).searchParams.get("location[directory]")).toBe("C:/tmp/")
       const url = await image.getAttribute("src")
@@ -557,7 +557,9 @@ for (const streaming of [false, true]) {
       await harness.getByLabel("Markdown text").fill("![Replacement](./images/next.png)")
       await expect
         .poll(() =>
-          harness.getByRole("img", { name: "Replacement" }).evaluate((image: HTMLImageElement) => image.naturalWidth),
+          harness
+            .getByRole("button", { name: "Replacement" })
+            .evaluate((image: HTMLImageElement) => image.naturalWidth),
         )
         .toBe(1)
       expect(requests).toHaveLength(2)
@@ -571,9 +573,9 @@ for (const streaming of [false, true]) {
           url,
         ),
       ).toBe(true)
-      const next = await harness.getByRole("img", { name: "Replacement" }).getAttribute("src")
+      const next = await harness.getByRole("button", { name: "Replacement" }).getAttribute("src")
       await harness.getByRole("button", { name: "Toggle Markdown" }).click()
-      await expect(harness.getByRole("img")).toHaveCount(0)
+      await expect(harness.locator("img")).toHaveCount(0)
       expect(
         await page.evaluate(
           (url) =>
@@ -602,9 +604,14 @@ story("keeps remote images browser-owned and rejects unsafe image sources", asyn
   }, fixture)
   const harness = page.getByTestId("markdown-fixture")
   await expect
-    .poll(() => harness.getByRole("img", { name: "Remote" }).evaluate((image: HTMLImageElement) => image.naturalWidth))
+    .poll(() =>
+      harness.getByRole("button", { name: "Remote" }).evaluate((image: HTMLImageElement) => image.naturalWidth),
+    )
     .toBe(1)
-  await expect(harness.getByRole("img", { name: "Remote" })).toHaveAttribute("src", "https://images.example/chart.png")
+  await expect(harness.getByRole("button", { name: "Remote" })).toHaveAttribute(
+    "src",
+    "https://images.example/chart.png",
+  )
   await expect(harness.locator("[onerror], [src^='javascript:'], [data-local-image]")).toHaveCount(0)
 })
 
@@ -628,7 +635,7 @@ story("keeps scripts and external resources inactive inside local SVG images", a
     const { mountMarkdown } = await import(fixture)
     await mountMarkdown({ images: true, text: "![SVG](Z:/charts/chart.svg)" })
   }, fixture)
-  const image = page.getByTestId("markdown-fixture").getByRole("img", { name: "SVG" })
+  const image = page.getByTestId("markdown-fixture").getByRole("button", { name: "SVG" })
   await expect.poll(() => image.evaluate((image: HTMLImageElement) => image.naturalWidth)).toBe(32)
   await expect(image).toHaveAttribute("src", /^data:image\/svg\+xml;/)
   await expect(page).not.toHaveTitle("image-script-ran")
@@ -662,12 +669,12 @@ story("loads file URLs and leaves unreadable images as alt text", async ({ page
   await expect
     .poll(() =>
       harness
-        .getByRole("img", { name: "Available", exact: true })
+        .getByRole("button", { name: "Available", exact: true })
         .evaluate((image: HTMLImageElement) => image.naturalWidth),
     )
     .toBe(1)
   await expect.poll(() => [...requested].sort()).toEqual(["/api/fs/read/chart%25.png", "/api/fs/read/missing.png"])
-  await expect(harness.getByRole("img", { name: "Unavailable" })).not.toHaveAttribute("src")
+  await expect(harness.getByRole("button", { name: "Unavailable" })).not.toHaveAttribute("src")
   await harness.getByLabel("Markdown text").fill("Still usable")
   await expect(harness.locator('[data-component="markdown"]')).toHaveText("Still usable")
 })
diff --git a/packages/session-ui/component-tests/read-image.fixture.tsx b/packages/session-ui/component-tests/read-image.fixture.tsx
index 4b503a8d4a64..a2d06b33a548 100644
--- a/packages/session-ui/component-tests/read-image.fixture.tsx
+++ b/packages/session-ui/component-tests/read-image.fixture.tsx
@@ -1,6 +1,7 @@
 import { createMemo, Show } from "solid-js"
 import { createStore } from "solid-js/store"
 import { render } from "solid-js/web"
+import { DialogProvider } from "@opencode/ui/context/dialog"
 import { OpenCode } from "@opencode/client/promise"
 import { readLocalImage } from "../../app/src/runtime/server/image"
 import { MarkdownProvider } from "../src/context/markdown"
@@ -25,36 +26,38 @@ export function mountReadImage(options: { path: string; grouped: boolean; runnin
       ...(state.appended ? [storyTool("read_next", "read", "completed", { path: "src/next.ts" })] : []),
     ])
     return (
-      <section style={{ "max-width": "720px", padding: "24px" }}>
-        <button onClick={() => setState("running", false)}>Finish read</button>
-        <button onClick={() => setState("appended", true)}>Append read</button>
-        <button onClick={() => setState("visible", false)}>Unmount tools</button>
-        <MarkdownProvider readImage={(path, signal) => readLocalImage(api, "C:/project", path, signal)}>
-          <CurrentSessionProviders document={storyDocument(tools())}>
-            <Show when={state.visible}>
-              <Show
-                when={options.grouped}
-                fallback={
-                  <ToolDisplay
-                    id="read_image"
-                    tool="read"
-                    input={{ path: options.path }}
-                    metadata={{}}
-                    status={status()}
+      <DialogProvider>
+        <section style={{ "max-width": "720px", padding: "24px" }}>
+          <button onClick={() => setState("running", false)}>Finish read</button>
+          <button onClick={() => setState("appended", true)}>Append read</button>
+          <button onClick={() => setState("visible", false)}>Unmount tools</button>
+          <MarkdownProvider readImage={(path, signal) => readLocalImage(api, "C:/project", path, signal)}>
+            <CurrentSessionProviders document={storyDocument(tools())}>
+              <Show when={state.visible}>
+                <Show
+                  when={options.grouped}
+                  fallback={
+                    <ToolDisplay
+                      id="read_image"
+                      tool="read"
+                      input={{ path: options.path }}
+                      metadata={{}}
+                      status={status()}
+                    />
+                  }
+                >
+                  <CurrentContextToolGroup
+                    parts={tools()}
+                    busy={state.running}
+                    open={state.open}
+                    onOpenChange={(open) => setState("open", open)}
                   />
-                }
-              >
-                <CurrentContextToolGroup
-                  parts={tools()}
-                  busy={state.running}
-                  open={state.open}
-                  onOpenChange={(open) => setState("open", open)}
-                />
+                </Show>
               </Show>
-            </Show>
-          </CurrentSessionProviders>
-        </MarkdownProvider>
-      </section>
+            </CurrentSessionProviders>
+          </MarkdownProvider>
+        </section>
+      </DialogProvider>
     )
   }, host)
 }
diff --git a/packages/session-ui/component-tests/read-image.spec.ts b/packages/session-ui/component-tests/read-image.spec.ts
index 956896fae830..966d91770b24 100644
--- a/packages/session-ui/component-tests/read-image.spec.ts
+++ b/packages/session-ui/component-tests/read-image.spec.ts
@@ -33,7 +33,7 @@ for (const grouped of [true, false]) {
       )
       const root = page.getByTestId("read-image-fixture")
       const trigger = root.getByRole("button", { name: "Read chart%20 one.PNG", exact: true })
-      const image = root.getByRole("img", { name: "chart%20 one.PNG", exact: true })
+      const image = root.getByRole("button", { name: "chart%20 one.PNG", exact: true })
       await expect(trigger).toHaveAttribute("aria-expanded", "false")
       await trigger.click()
       await expect(trigger).toHaveAttribute("aria-expanded", "false")
@@ -115,7 +115,7 @@ for (const width of [840, 390]) {
       )
       const root = page.getByTestId("read-image-fixture")
       await root.getByRole("button", { name: "Read chart.svg", exact: true }).click()
-      const image = root.getByRole("img", { name: "chart.svg", exact: true })
+      const image = root.getByRole("button", { name: "chart.svg", exact: true })
       await expect(image).toHaveJSProperty("naturalWidth", 1200)
       await expect(image).toHaveAttribute("src", /^data:image\/svg\+xml;/)
       expect(
@@ -140,7 +140,7 @@ story("keeps an unavailable image read collapsible", async ({ page }) => {
   const response = page.waitForResponse("**/api/fs/read/**")
   await trigger.click()
   expect((await response).status()).toBe(404)
-  await expect(root.getByRole("img", { name: "missing.png", exact: true })).not.toHaveAttribute("src")
+  await expect(root.getByRole("button", { name: "missing.png", exact: true })).not.toHaveAttribute("src")
   await trigger.click()
   await expect(trigger).toHaveAttribute("aria-expanded", "false")
 })
diff --git a/packages/session-ui/src/components/image-preview.tsx b/packages/session-ui/src/components/image-preview.tsx
new file mode 100644
index 000000000000..17590048ec33
--- /dev/null
+++ b/packages/session-ui/src/components/image-preview.tsx
@@ -0,0 +1,31 @@
+import { useDialog } from "@opencode/ui/context/dialog"
+import { useI18n } from "@opencode/ui/context/i18n"
+import { ImagePreview } from "@opencode/ui/image-preview"
+
+export function createImagePreview() {
+  const dialog = useDialog()
+  const i18n = useI18n()
+  const open = (event: MouseEvent | KeyboardEvent) => {
+    if (!(event.currentTarget instanceof HTMLImageElement)) return
+    const src = event.currentTarget.currentSrc || event.currentTarget.getAttribute("src")
+    if (!src) return
+    const alt = event.currentTarget.alt || i18n.t("ui.imagePreview.alt")
+    event.preventDefault()
+    event.stopPropagation()
+    dialog.show(() => <ImagePreview src={src} alt={alt} />)
+  }
+
+  return (root: HTMLElement) => {
+    root.querySelectorAll<HTMLImageElement>("img").forEach((image) => {
+      image.setAttribute("role", "button")
+      image.setAttribute("aria-haspopup", "dialog")
+      image.setAttribute("aria-label", image.alt || i18n.t("ui.imagePreview.alt"))
+      image.tabIndex = 0
+      image.onclick = open
+      image.onkeydown = (event) => {
+        if (event.key !== "Enter" && event.key !== " ") return
+        open(event)
+      }
+    })
+  }
+}
diff --git a/packages/session-ui/src/components/markdown.css b/packages/session-ui/src/components/markdown.css
index 7b613ec34038..480500c3c6f6 100644
--- a/packages/session-ui/src/components/markdown.css
+++ b/packages/session-ui/src/components/markdown.css
@@ -329,6 +329,7 @@
 
   /* Images */
   img {
+    cursor: zoom-in;
     max-width: 100%;
     height: auto;
     border-radius: 4px;
diff --git a/packages/session-ui/src/components/markdown.tsx b/packages/session-ui/src/components/markdown.tsx
index 267a1e120171..75441b4d6eaf 100644
--- a/packages/session-ui/src/components/markdown.tsx
+++ b/packages/session-ui/src/components/markdown.tsx
@@ -39,6 +39,7 @@ import { renderMermaidSvg } from "./markdown-mermaid"
 import { createMarkdownRenderer } from "./markdown-solid"
 import { useMarkdown, type ReadMarkdownImage } from "../context/markdown"
 import { createMarkdownImages } from "./markdown-image"
+import { createImagePreview } from "./image-preview"
 
 type RenderedBlock =
   | (MarkdownCacheEntry & { key: string; mode: Exclude<Block["mode"], "code"> })
@@ -394,6 +395,7 @@ export function Markdown(
   const [local, others] = splitProps(props, ["text", "cacheKey", "streaming", "deferUntilReady", "class", "classList"])
   const i18n = useI18n()
   const markdown = useMarkdown()
+  const previewImages = createImagePreview()
   const [root, setRoot] = createSignal<HTMLDivElement>()
   const owner = createUniqueId()
   const lifetime = new AbortController()
@@ -557,6 +559,7 @@ export function Markdown(
       child.remove()
     }
     images?.update(container)
+    previewImages(container)
     container
       .querySelectorAll<HTMLElement>('[data-slot="markdown-copy-button"]')
       .forEach((button) => setCopyState(button, labels, button.dataset.copied === "true"))
diff --git a/packages/session-ui/src/components/message-part.css b/packages/session-ui/src/components/message-part.css
index 6b38f96a1e1b..24baa32d5ea9 100644
--- a/packages/session-ui/src/components/message-part.css
+++ b/packages/session-ui/src/components/message-part.css
@@ -369,6 +369,7 @@
   min-width: 0;
 
   img {
+    cursor: zoom-in;
     display: block;
     max-width: 100%;
     height: auto;
diff --git a/packages/session-ui/src/tools/tool-renderer.tsx b/packages/session-ui/src/tools/tool-renderer.tsx
index ab985cfe4834..3eb2bec70203 100644
--- a/packages/session-ui/src/tools/tool-renderer.tsx
+++ b/packages/session-ui/src/tools/tool-renderer.tsx
@@ -28,6 +28,7 @@ import { ToolErrorCard } from "../components/tool-error-card"
 import { DiffChanges } from "@opencode/ui/diff-changes"
 import { Markdown } from "../components/markdown"
 import { createMarkdownImages } from "../components/markdown-image"
+import { createImagePreview } from "../components/image-preview"
 import { useMarkdown } from "../context/markdown"
 import { getDirectory, getFilename } from "@opencode/util/path"
 import { checksum } from "@opencode/util/encode"
@@ -1366,8 +1367,10 @@ ToolRegistry.register({
 
 function ReadImage(props: { path: string; onContentRendered?: () => void }) {
   const markdown = useMarkdown()
+  const previewImages = createImagePreview()
   let root!: HTMLDivElement
   createEffect(() => {
+    previewImages(root)
     if (!markdown?.readImage) return
     const images = createMarkdownImages(markdown.readImage)
     images.update(root)