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fix(dsh-plugin): add PiP close button and sniff observation thumbnail media type

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The Document PiP window had no close/return entry once popped out —
users could not dismiss it from inside the window. Add an onClosePip
callback and render a close button in the PiP header; clicking it
calls pipWindow.close() and the content returns to its carrier.

The observation thumbnail publisher hardcoded mediaType as "image/png"
regardless of the actual capture bytes. Reuse the existing
sniffImageMediaType helper (exported from image.ts) so the HTTP
thumbnail endpoint declares the correct Content-Type when Chromium
returns JPEG captures.

Closes #153 (Bug 2 fully; Bug 1 was fixed in #135, this covers the
remaining observation-thumbnail path).

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
drakezhang
2026-09-02 16:14:24 +08:00
co-authored by Cursor
parent 49744233f7
commit 51473c01ff
6 changed files with 58 additions and 2 deletions
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packages/dsh-plugin-browserskill/src/image.ts
+1 -1
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@@ -42,7 +42,7 @@ interface LlmLike {
* @param data - first bytes of the capture.
* @returns the detected media type, or undefined when unrecognized.
*/
function sniffImageMediaType(data: Uint8Array): string | undefined {
export function sniffImageMediaType(data: Uint8Array): string | undefined {
if (data.length >= 4) {
// PNG signature: 89 50 4E 47 (0D 0A 1A 0A)
if (data[0] === 0x89 && data[1] === 0x50 && data[2] === 0x4e && data[3] === 0x47) {