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Sharing an agent encodes a `.agent.png` snapshot with the avatar as the PNG image body. Non-PNG avatars were transcoded at full resolution and already-PNG avatars were carried through unchanged, so a large source avatar could produce a PNG that exceeds the 10 MiB `MAX_SNAPSHOT_PNG_BYTES` cap and fail the send. A 2764×4096 webp avatar encoded to ~26 MB — over 2.5× the ceiling — which is why sharing that agent hung for a few seconds (fetching and transcoding the image) and then failed. The share dialog compounded the problem: on failure it discarded the pipeline's real error (`Snapshot exceeds the 10 MiB size limit…`) and toasted a generic `Couldn't send … Try again.`, hiding the actual cause. ## Changes - **Downscale the avatar for the snapshot PNG body.** The body is only a card thumbnail, so raster avatars are now downscaled to a 512px longest edge (`MAX_PNG_BODY_EDGE`) before PNG re-encoding, mirroring the frontend SVG rasterizer's 512×512 cap in `snapshotAvatarPng.ts`. Already-PNG avatars over the dimension cap route through the same downscaling transcode path instead of a straight tEXt-chunk injection. The manifest's `avatar_url`/`avatar_data_url` source reference is untouched — only the PNG image body is downscaled. - **Surface the real error in the share dialog.** `PersonaShareDialog` (used by `SnapshotShareDialog`/`TeamShareDialog`) and `AgentCardViewerDialog` now toast the send controller's actual error message, falling back to the generic string only when it is empty. A `getCurrentError()` accessor reads the error through a ref because the render-captured `state.error` is stale in the closure immediately after `beginSend` resolves. A unit test pins the invariant: an oversize (2764×4096) avatar produces a snapshot that stays far under the cap with body dimensions clamped to 512px. --------- Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Duncan <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz> Co-authored-by: Duncan <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>