feat(research): add project list presentation model

[hubab1]

Summary

• add a closure-injected, explicitly @MainActor observable project-list presentation model
• preserve prior rows across reload and pagination failures with exact continuation offsets and ID deduplication
• add stable project and keyword draft UUIDs for idempotent persistence retries
• map store, provider, and Apple Ads issues to fixed redacted user-facing messages and truthful accessibility descriptions
• preserve the three-commit history covering the base model, load-state restoration, and detail-revision reconciliation

Correctness

• stale or cancelled loads cannot overwrite a newer publication
• mutations check cancellation before persistence but never report cancellation after a successful commit return
• a mutation before the initial page, or one that supersedes an in-flight load, exposes requiresReload and blocks unsafe continuation paging until recovery succeeds
• stale destructive mutations surface a conflict and are never retried automatically
• creating and deleting rows preserve or adjust valid pagination offsets instead of hiding later pages

This progresses #3 but does not close it.

Validation

• focused presentation-model tests passed
• full OpenASO suite passed: 563 tests (567 parameterized test invocations)
• project-file lint and whitespace checks passed