fix(tui): explicitly register spinner to survive Windows tree-shaking

[LeXwDeX]

Problem

The Windows release binary (opencode.exe) crashes at runtime with [Reconciler] Unknown component type: spinner the first time <spinner> renders. The prior fix (#90, lockfile dedupe) did not stop it.

Root cause

On a Windows host, bun build drops the side-effect-only import "opentui-spinner/solid". That package declares sideEffects: ["./dist/solid.mjs"] as a forward-slash glob, which Bun does not match against backslash paths on a Windows builder. The extend({ spinner }) call inside it never executes, so the reconciler has no spinner component registered. macOS/Linux match fine (forward-slash paths), which is why only Windows crashes.

Verified against the released v1.17.11-dev.10 artifacts:

Binary	Spinner interval must be a finite	createPulse requires at least one color
opencode.exe (Windows)	0	0
opencode (macOS)	1	1

The Windows binary contains zero spinner runtime code — the registration was tree-shaken out.

Fix

Register the spinner explicitly via extend({ spinner: SpinnerRenderable }) in a local module imported by every <spinner> render path. The explicit extend(...) carries a real value dependency the bundler cannot drop.

• packages/tui/src/ui/spinner-register.ts (new) — used by the TUI
• packages/opencode/src/cli/cmd/run/spinner-register.ts (new) — used by the opencode run footer
• 4 call sites swap import "opentui-spinner/solid" → the local registration module

The retained opentui-spinner/solid side-effect import is not redundant: it provides JSX type augmentation for <spinner>. At runtime it re-registers too, but extend is Object.assign over a flat catalogue, so double registration is harmless. This mirrors the existing extend({ go_upsell_art }) pattern in packages/tui/src/component/bg-pulse.tsx.

Verification

• bun typecheck in packages/tui — PASS
• bun typecheck in packages/opencode — PASS
• Local ./packages/opencode/script/build.ts --single --skip-install --skip-embed-web-ui — PASS, smoke test --version PASS
• Local compiled binary string inspection: spinner runtime strings present (were absent in the failing Windows release)

Follow-up (not in this PR)

A real end-to-end fix confirmation requires the Windows CI build. Suggested: add a post-build check on the Windows artifact that greps opencode.exe for Spinner interval must be a finite (>0) so this regression cannot recur silently.

Checklist

• Branch cut from main, PR targets dev
• Conventional commit title
• Only spinner-related files changed (6 files, no unrelated diff)