feat(marketer): campaign/content draft-approve-schedule-publish loop (#3148/#3149)

[kevinthelago]

Summary

The frontend slice of the Marketer epic's remaining phases (#3145 P3/P4), scoped to src/features/marketer/** per the marketer stream's fleet assignment.

• Domain model + state machine (lib/campaign.ts) — Campaign/ContentItem, the draft → approved → {scheduled, published} transitions (Marketer P3 — campaign/content store + draft→approve→publish loop #3148: publish is never reachable directly from draft), dueForDispatch for scheduled items whose fire time has passed.
• Compliance guardrails (lib/compliance.ts, Marketer P5 — persona rewrite + skills + docs + compliance guardrails #3150) — email requires an unsubscribe link + sender identity (CAN-SPAM/GDPR); social enforces a channel length limit; all content is checked for PII-shaped strings. A content item with any violation cannot reach approved (enforced in store.ts's approveContentItem).
• Channel status view (lib/channels.ts, Marketer P1 — first channel MCP server + keychain-backed secret env #3146) — derives a channel list from the mcp feature's installed-server catalog (consumed only via its public barrel, @/features/mcp), tagging installed/assigned state.
• Analytics read-back (lib/metrics.ts, Marketer P4 — analytics read-back + iterate #3149) — rollup + per-channel readout formatting, mirroring crates/channel's get_metrics shape ({ total, by_tool }).
• Contract-first backend bridge (lib/api.ts) — marketing_* Tauri command calls with graceful degrade (the same pattern sourceConnection.ts uses for data_platform_scan): the UI works standalone today and will pick up the real backend the moment crates/marketing + its Tauri commands land, with no code change.
• Store (store.ts) — a standalone Zustand store (persisted via the same persistStorage adapter the composed app store uses, under its own "bsc-marketer" key). Not folded into useAppStore — that needs a two-line edit to src/store/index.ts + src/store/types.ts, both outside this feature's write scope. Noted as a follow-up integration step.
• UI (MarketerWorkspace.tsx, ContentDrawer.tsx, MarketerStatus.tsx) — Campaigns/Channels/Analytics tabs, the compose→approve→schedule→publish drawer, and a compact status widget. Not yet mounted to a rail Workspace or Settings page (a director-owned integration step); exported from the feature's index.ts barrel, ready for it.

Notes on scope

• #3146's remaining acceptance criteria (keychain-backed secret env, the Settings "connect a channel" UI) are deliberately deferred per the issue's own comment thread — the owner noted both land when the real beautiful-emails channel needs credentials, not for the mock channel.
• #3147 (outbound confirm gate + role tier) and the rest of #3150 (persona/skills/docs) touch src/shared/lib/session/** and src-tauri/data/personas/** — outside this feature's write scope; left to whichever stream owns those paths.
• #3800 (Glance marketing tab + standing maintainer session) is explicitly filed-not-scheduled in the epic.

Test plan

• npm run typecheck — clean
• npm run lint — 0 errors in src/features/marketer/** (0 new warnings)
• npx vitest run src/features/marketer — 48/48 passing (pure lib tests, store tests, component tests)
• npm test (full suite) — 6076/6078 passing; the 2 failures are pre-existing, unrelated src/features/designs/lib/reactUiKit.gen.test.ts CRLF hash-sidecar failures (untouched by this PR)

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01WDc7B2fkQxzAjhZPRfTRQ7