fix: honor platform override on image pull and clarify wizard compat UX

[skevetter]

Summary

• Fixes the real launch failure where an amd64-only image (e.g. mcr.microsoft.com/devcontainers/universal:2) on an arm64 host failed with no matching manifest for linux/arm64/v8. EnsureImage pulled the image with no platform flag, so the pull failed before docker run --platform was ever reached — making the wizard's emulation override effectively dead.
• pkg/docker: refactor Pull to take a PullOptions config struct (Image, Platform, Stdin, Stdout, Stderr) and thread Platform through to docker pull --platform.
• pkg/driver/docker: EnsureImage now passes RunOptions.Platform into the pull.
• Desktop wizard review step: image-compat check now always resolves to a definite state — compatible (green check + supported platforms), incompatible (existing amber warning + supported platforms), or unknown (neutral "couldn't verify" note) — instead of flashing "Checking image compatibility…" and vanishing with no result.
• Desktop wizard cleanup: removed the confusing "Auto-suggested / Resolved id" helper lines; aligned the Ref Type dropdown height with the adjacent input.

Notes

• Scope intentionally minimal: this makes the platform override work and surfaces the compat result. A Go-side fail-fast pre-check (clear error when an image is incompatible and no override is given) is not included here and remains a follow-up.
• Emulation still requires host qemu/Rosetta binfmt to actually exec the foreign-arch container.

[netlify]

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🔨 Latest commit	30300be
🔍 Latest deploy log	https://app.netlify.com/projects/devsydev/deploys/6a2421cce215050008c74d0c

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8abd61ad-9dfd-475a-aefb-32245f9e4ca6

📥 Commits

Reviewing files that changed from the base of the PR and between 711806e and 30300be.

📒 Files selected for processing (6)

• desktop/src/renderer/src/lib/components/workspace/WorkspaceWizard.platform.test.ts
• desktop/src/renderer/src/lib/components/workspace/WorkspaceWizard.svelte
• e2e/tests/up-docker-compose/helper.go
• pkg/docker/helper.go
• pkg/docker/helper_test.go
• pkg/driver/docker/docker.go

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