fix(sharing): preserve invitation completion state

[kunickiaj]

Description

Keep successful Team and add-device invitation acceptance visible in the open dialog instead of resetting to the paste form.

The dialog now enters a stable, focused completion state with truthful restart guidance, removes all repeat review/accept controls, guards against duplicate submissions, and resets only after explicit close/reopen. Project-share completion behavior remains unchanged. The raw close glyph is replaced with the shared accessible close-button primitive, and the result uses a restrained responsive success surface consistent with existing theme tokens.

This fixes the dogfood failure where successful acceptance looked like a reset or failed operation.

Type of Change

• 🚀 Feature (new functionality)
• 🐛 Bug fix (fixes an issue)
• 📚 Documentation (docs-only change)
• 🔧 Maintenance (refactor, chore, CI, etc.)
• 🧪 Testing (test-only changes)

Testing

• Relevant checks pass locally (pnpm run tsc, pnpm run lint, pnpm run test)
• Added/updated tests for changes
• Manually verified changes work as expected

Additional validation:

• pnpm exec vitest run packages/ui/src/tabs/recipient-policy-invitations.test.tsx
• pnpm --filter @codemem/ui typecheck
• pnpm --filter @codemem/ui build
• Independent state-machine, accessibility, and test-coverage reviews

Checklist

• Code follows project style (pnpm run lint passes for touched files)
• Self-review completed
• Documentation updated (if needed)
• No new warnings introduced

[kunickiaj]

• fix(sharing): preserve invitation completion state #1359 👈 (View in Graphite)
• feat(sharing): authorize identity-owned device invites #1360
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[graphite-app]

Merge activity

• Jul 25, 3:02 PM UTC: Graphite rebased this pull request, because this pull request is set to merge when ready.
• Jul 25, 3:05 PM UTC: Graphite rebased this pull request, because this pull request is set to merge when ready.
• Jul 25, 3:10 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jul 25, 3:11 PM UTC: Graphite rebased this pull request as part of a merge.
• Jul 25, 3:15 PM UTC: @kunickiaj merged this pull request with Graphite.