fix(frontend/builder): open publish dialog scoped to current agent (#13140)

### Why / What / How

**Why:** Clicking **Publish** from the builder opened the generic
publish flow with the agent picker — even though the builder already
knows the agent the user is editing. Users had to re-pick the same agent
before reaching the listing form.
([SECRT-2361](https://linear.app/autogpt/issue/SECRT-2361))

**What:** Pre-scope the publish dialog to the current agent (`graphID` +
`graphVersion`) and skip the picker step when launched from the builder.
Library and Dashboard entry points still open with the picker as before.

**How:** The `PublishAgentModal` already supports a scoped mode —
Library uses it today by opening at `step: "info"` with
`preSelectedAgentId` + `preSelectedAgentVersion`. The builder simply
wasn't passing the version through and was opening at `step: "select"`.
Threaded `flowVersion` through `BuilderActions → PublishToMarketplace →
usePublishToMarketplace`, and opened the modal at the listing step. As a
defensive fix in `usePublishAgentModal.handleBack`, scoped opens (any
caller passing `preSelectedAgentId`) now close the modal on Back instead
of surfacing the picker the caller intentionally skipped — this also
fixes the same latent issue in the Library entry point.

### Changes 🏗️

- `BuilderActions.tsx` — read `flowVersion` from `useQueryStates` and
pass it to `PublishToMarketplace`.
- `PublishToMarketplace.tsx` — accept `flowVersion`, forward to the
hook, pass `preSelectedAgentVersion` to the modal, disable the trigger
if either id or version is missing. Switched to a function declaration
with `interface Props`.
- `usePublishToMarketplace.ts` — guard on both `flowID` and
`flowVersion`; open the modal at `step: "info"` instead of `"select"`.
- `usePublishAgentModal.ts` — in `handleBack`, when `step === "info"`
and `preSelectedAgentId` is set, call `handleClose()` instead of
returning to the picker.
- New integration test:
`PublishToMarketplace/__tests__/PublishToMarketplace.test.tsx` (Vitest +
RTL + MSW).

No backend changes.

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [ ] I have tested my changes according to the test plan:
- [ ] From the builder, click **Publish** → the listing form opens
pre-filled with the current agent (no picker shown).
- [ ] Click **Back** from the listing form (scoped open) → modal closes
(does not surface picker).
- [ ] From **Library** → publish an agent → still opens scoped on that
agent; Back closes.
- [ ] From **Dashboard / Become a Creator** → publish → picker still
shows; selecting an agent advances to the listing step as before.
- [ ] Submit a listing end-to-end from the builder entry point → review
step renders.
- [ ] Open builder URL without `flowVersion` query param → Publish
button is disabled.
- [ ] New integration test passes: `pnpm test:unit
src/app/\(platform\)/build/components/BuilderActions/components/PublishToMarketplace/__tests__/PublishToMarketplace.test.tsx`