[Crash Report] Trying to blend 2 images

**Describe the Crash**
I imported 2 images in the editor, then added a Rasterize blend node, when I tried to connect the output of the blend node to a transform to output in a layer it crashed

**Steps To Reproduce**
Describe precisely how the crash occurred, step by step, starting with a new editor window.
1. Open the Graphite editor at https://editor.graphite.rs
2. add 2 images
3. add blend node
4. output blend to a layer
5.

**Additional Details**
Provide any further information or context that you think would be helpful in fixing the issue. Screenshots or video can be linked or attached to this issue.

**Browser and OS**
Chrome 130, Mac

**Stack Trace**
Copied from the crash dialog in the Graphite editor:

```
panicked at node-graph/gcore/src/raster/image.rs:162:9:
assertion `left == right` failed
left: 211600
right: 1558440

Error
at https://editor.graphite.rs/assets/index-StBtR31p.js:706:1169
at p (https://editor.graphite.rs/assets/index-StBtR31p.js:691:5216)
at Object.handleJsMessage (https://editor.graphite.rs/assets/index-StBtR31p.js:691:5364)
at https://editor.graphite.rs/assets/index-StBtR31p.js:692:63200
at https://editor.graphite.rs/assets/index-StBtR31p.js:692:35871
at et (https://editor.graphite.rs/assets/index-StBtR31p.js:692:1842)
at P0.o.wbg.__wbg_call_5fb7c8066a4a4825 (https://editor.graphite.rs/assets/index-StBtR31p.js:692:35841)
at graphite_wasm.wasm._ZN13graphite_wasm10editor_api12EditorHandle27send_frontend_message_to_js17he2260553331a2c0eE (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[3760]:0x80c152)
at graphite_wasm.wasm._ZN4core3ops8function2Fn4call17haad1996cb846aa98E (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[13566]:0xaccd7c)
at graphite_wasm.wasm._ZN3std9panicking20rust_panic_with_hook17he5c089ac7305193eE (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[6938]:0x9a80e6)
at graphite_wasm.wasm._ZN4core9panicking9panic_fmt17hdc8d2d914c0710e4E (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[10356]:0xa7e74c)
at graphite_wasm.wasm._ZN4core9panicking19assert_failed_inner17hac6df1fbe8940f48E (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[4538]:0x8a2e32)
at graphite_wasm.wasm._ZN13graphene_core6raster5image14Image$LT$P$GT$10to_flat_u817h4555360db951b76cE (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[2052]:0x65b99d)
at graphite_wasm.wasm._ZN13graphene_core6raster5image48Image$LT$graphene_core..raster..color..Color$GT$6to_png17h47de683678e9d25eE (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[5226]:0x8fe603)
at graphite_wasm.wasm._ZN123_$LT$graphene_core..graphic_element..Raster$u20$as$u20$graphene_core..graphic_element..renderer..GraphicElementRendered$GT$10render_svg17h7930ea5fdb36609dE (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[1123]:0x4d133b)
at graphite_wasm.wasm._ZN129_$LT$graphene_core..graphic_element..GraphicGroup$u20$as$u20$graphene_core..graphic_element..renderer..GraphicElementRendered$GT$10render_svg17ha65ae070e1b3686eE (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[1339]:0x55148b)
at graphite_wasm.wasm._ZN12graphene_std19wasm_application_io6render28_$u7b$$u7b$closure$u7d$$u7d$17h05695b0b382f62c1E (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[533]:0x2ed250)
at graphite_wasm.wasm._ZN150_$LT$graphene_core..registry..DynAnyNode$LT$_I$C$_O$C$N$GT$$u20$as$u20$graphene_core..Node$LT$alloc..boxed..Box$LT$dyn$u20$dyn_any..DynAny$GT$$GT$$GT$4eval28_$u7b$$u7b$closure$u7d$$u7d$28_$u7b$$u7b$closure$u7d$$u7d$17h09caeea081fb414aE (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[6121]:0x95db0e)
at graphite_wasm.wasm._ZN173_$LT$$RF$interpreted_executor..dynamic_executor..DynamicExecutor$u20$as$u20$graph_craft..graphene_compiler..Executor$LT$I$C$graph_craft..document..value..TaggedValue$GT$$GT$7execute28_$u7b$$u7b$closure$u7d$$u7d$17haa162f81f698bdb7E.llvm.10675772075615849968 (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[3839]:0x81a715)
at graphite_wasm.wasm._ZN13graphite_wasm10editor_api26poll_node_graph_evaluation28_$u7b$$u7b$closure$u7d$$u7d$17hf0998fcf8cb87065E (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[5317]:0x91193c)
at graphite_wasm.wasm._ZN20wasm_bindgen_futures5queue10QueueState7run_all17hd97bfc3873db4599E (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[3837]:0x81a0be)
at graphite_wasm.wasm._ZN20wasm_bindgen_futures5queue5Queue3new28_$u7b$$u7b$closure$u7d$$u7d$17h09657dd8eac6fbb0E.llvm.4933978826303673485 (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[11857]:0xaa29aa)
at graphite_wasm.wasm._ZN136_$LT$dyn$u20$core..ops..function..FnMut$LT$$LP$A$C$$RP$$GT$$u2b$Output$u20$$u3d$$u20$R$u20$as$u20$wasm_bindgen..closure..WasmClosure$GT$8describe6invoke17h34d207096920c174E (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[11856]:0xaa299c)
at graphite_wasm.wasm.closure10070 externref shim (https://editor.graphite.rs/assets/graphite_wasm_bg-hUH_VdBe.wasm:wasm-function[12019]:0xaa4769)
at y0 (https://editor.graphite.rs/assets/index-StBtR31p.js:692:891)
at i (https://editor.graphite.rs/assets/index-StBtR31p.js:692:266)
```

Bắt đầu tại node-graph/gcore/src/raster/image.rs ở dòng 162 và lần theo Image::to_flat_u8 qua to_png và render_svg trong stack trace. Tái hiện crash trong trình chỉnh sửa Graphite bằng hai hình ảnh đã nhập, một Rasterize blend node và một layer output. Hoàn tất khi workflow này không còn panic khi blend output được kết nối với một layer.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.