th-1fca98: render cross-client images + bump engine to persist them

[brentrager]

Problem

A photo sent from the iOS Big Smooth app showed only as text in the desktop app's view of the same conversation — the image never reached other clients' history.

Fix (smooth side; the engine fix is smooth-operator #564, merged)

• Engine bump: smooth-operator-server/svc git rev b6c6b84 → 9b30ed7b, which carries the persistence fix (a user turn's images are now stored as image content items). This moves core 1.7.10 → 1.10.0.
  • Core 1.10 adds three additive AgentEvent::Completed fields (spend taint flags + response id, th-126fe6) and makes Session.agent_id optional. The handful of construction sites (smooth-cast, smooth-code, one test in smooth-daemon) were updated to the serde defaults older output already produced — no behavior change.
• Web render: history parsing extracted from operator.ts into a pure, unit-testable history.ts. historyImages() turns persisted type:'image' items into renderable attachments; renderHistory sets them on user turns. App.tsx's live-send path already renders m.attachments, so images now appear on history load too. (operator.ts itself isn't node-testable — it uses Vite-only extensionless imports — which is why the pure logic moved.)

Verification

• Full workspace cargo build + clippy --workspace --all-targets clean; smooth-cast / smooth-code / smooth-daemon suites green (776 tests).
• history.test.ts: image items → attachments (data: mime + https image/* default), empty for text-only / string / old-daemon shapes.
• vite build clean; typecheck clean; pre-commit (fmt + clippy + format:check) green.

Parity follow-up

iOS + Android should render persisted image items in their transcript history too ("always parity on mobile"). Reachable now that the engine persists them; tracked under the same pearl.

🤖 Generated with Claude Code

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Latest commit: 73b5d08

The changes in this PR will be included in the next version bump.

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@smooai/smooth	Patch

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