feat: protect campaign edits and persist version state

[Ankit6149]

Closes #18.
Closes #20.
Closes #21.

Product outcome

This PR makes regeneration edit-safe, turns campaign/channel/version status into persistent product state, and completes stable campaign identity with explicit create/update/save-as-copy/read/list/delete behavior.

Issue #18 — edit-safe regeneration

• Stores one generated baseline and one authoritative current draft per channel.
• Detects manual edits and clears approval when text changes.
• Adds a deliberate full-regeneration dialog: regenerate unedited destinations, archive and regenerate all, or cancel.
• Adds per-channel regeneration.
• Preserves untouched channels byte-for-byte.
• Archives complete prior campaign versions and supports restore/discard.
• Restores the generated baseline per channel.
• Rejects malformed/all-failed regeneration before reducer mutation.
• Keeps existing drafts intact when a regeneration request fails or a requested destination fails within partial success.

Issue #20 — persistent state and action truth

• Adds pure selectors for generated, regenerated, edited, approved, needs-review, failed, stale, saved, unsaved, and exported-current state.
• Adds a persistent campaign status strip with revision, approval/edit counts, last saved time, and export freshness.
• Adds status text to every channel tab and active draft.
• Makes publishing/manual handoff require explicit approval of the current revision.
• Derives copy/export/publish availability from shared selectors and shows visible blocked reasons.
• Adds accessible live status, modal semantics, Escape cancellation, responsive behavior, and reduced-motion handling.

Issue #21 — stable identity and persistence

• Uses an injected opaque campaign ID service; titles are never identity.
• Adds detached-safe create, update, save-as-copy, read, list, and delete application functions.
• Save updates only the current ID; Save as copy allocates a new ID and preserves the original.
• Allows multiple campaigns with the same title.
• Persists generated baselines, channel state, approvals, archives, and editor save/export revisions.
• Migrates legacy and incomplete additive schema-v1 records without losing drafts/history.
• Writes completed additive records back through browser and injected store-backed repositories.
• Excludes temporary provider credentials.
• Provides export-recovery messaging for browser storage/quota failure.

Documentation

Updates README, AGENTS, domain architecture, campaign migration/rollback, and docs/CAMPAIGN_EDITING_AND_VERSIONING.md. Documentation tests guard regeneration, stable identity, approval, migration, accessibility, and rollback claims.

Exact-head verification

Verified head: 7f669810db8442cb5779ab689945d08bd4a88967

GitHub Actions CI run 254 passed:

• 123 frontend regression/domain/persistence/UI/documentation tests;
• edit-safe policy, archive/restore, approval, and state-selector tests;
• duplicate-title CRUD, detached application calls, Save as copy, legacy/additive migration, and quota recovery tests;
• production dependency audit with zero vulnerabilities;
• Next.js production build;
• MCP protocol/tool tests;
• Python compatibility tests.

Vercel preview deployment succeeded for the exact final head. No temporary migration scripts/workflows or unresolved review threads remain.

Explicit non-goals

• Does not implement cloud persistence, sync, collaboration, or server-side version history.
• Does not implement durable background generation jobs.
• Does not close generation-quality, connector-verification, or extension-ingestion issues.
• Does not claim live connector publishing is production-verified.

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Project	Deployment	Actions	Updated (UTC)
signal-flow-studio	Ready	Preview	Jul 30, 2026 6:08pm

[Ankit6149]

Post-merge verification

• Squash-merged into master as fd707c4201d0014afbda3cfd0454d593bb1c5f01.
• Issues [P0][Plan 1] SF-004 — Protect manual edits during regeneration #18, [P1][Plan 1] SF-022 — Show explicit dirty, stale, edited, saved, and version states #20, and [P2][Plan 1] SF-023 — Stop same-title campaigns from overwriting each other #21 closed automatically as completed.
• Exact final PR head 7f669810db8442cb5779ab689945d08bd4a88967 passed CI run 254: 123 frontend tests, production dependency audit with zero vulnerabilities, Next.js production build, MCP tests, and Python tests.
• Exact-head Vercel preview succeeded.
• No temporary migration workflows/scripts or unresolved review threads remain.
• The merged scope does not claim cloud persistence/sync, durable generation jobs, extension ingestion, or credential-backed connector verification.