AUTH-006G — Announce a confirmed profile-name save and preserve focus

[daliu]

Closes #651

Officer impact: No live officer workflow changes are claimed by this pull request. When this exact website revision is separately published, a member whose full-name Save is confirmed by the current authoritative reread will see Profile name saved. and otherwise-lost focus will return to that result only when Save owned focus.

Officer documentation: SYSTEM_DESIGN.md, IMPLEMENTATION_PLAN.md, SECURITY.md, and docs/officers/EVENTS_SHOP_MEMBERS.md (matching My Account Mermaid/text alternative plus one no-terminal AUTH-006G source-evidence procedure).

Deployment evidence: Exact-head GitHub Actions run 31768237900 completed successfully with all five required jobs green. Netlify deploy-preview 6a7e9193716ef50008b3b8b4 is ready for exact commit 6eda03b9cedc69ba5ff81d951d7ba9472cb72179; header and redirect checks passed, Pages-changed was correctly neutral, published_at is null, and provider metadata reports no Functions or Edge Functions. The preview is not production publication. No Firebase deployment, provider configuration, account/sign-in action, production-data action, production website publication, or live verification was performed. Optional-directory availability remains byte-for-byte false; live #623 remains the inert directory preview; #507 retains every directory connection and release gate.

Outcome

• Render the fixed polite, atomic Profile name saved. result only after the exact current update and successful non-null authoritative profile reread.
• Restore otherwise-lost focus to that result only when the admitted Save button owned focus; preserve every other connected focus and keep programmatic/unfocused Save focus-inert.
• Keep heading/result/Edit DOM order with a bounded two-row Profile header and a scoped visible programmatic-focus outline.
• Preserve existing validation, payload, one-attempt/context fences, generic unconfirmed-change recovery, service-call counts, and backend behavior.

Local evidence

• Trustworthy unchanged-runtime RED: 1 expected failure / 243 skipped; test-only digest df02329a39ee24b127f801d4a8726f5748bdff0b992b8706a16456bbeb2fd66f.
• AUTH-006G: 22/22 pass.
• Full Account: 265/265 pass.
• Full frontend: 18/18 suites, 1274/1274 tests pass under Node 20.
• Repository Node tests: 105/105 pass under Node 20.
• TypeScript --noEmit: pass.
• Scoped ESLint: pass.
• Frontend lint baseline: pass (120 files; 113 reviewed legacy errors; 6 reviewed legacy warnings).
• Diagnostic production build: pass.
• git diff --check: pass.
• Independent frontend/accessibility/mobile, security/privacy/race, and backup-officer/operations reviews: GO.

Exact candidate

• Base: 4f11ddd1f87cf10d40a620c1d32389276b8073f6
• Candidate: 6eda03b9cedc69ba5ff81d951d7ba9472cb72179
• Tree: cd8c32d73021b026e145325d968f0a3cedf9bbff
• Seven-path binary diff SHA-256: 27fa38b16444db7c823d9eb0e589d6e2ddc73839d61e32f6dd0729327b672dcc
• Runtime/test/CSS diff SHA-256: c00a6c7e0486dcdfbb0e9d0a4b4c48215f03e3e8c72634fc1f2b17142c08c1d5

No migration. Unconfirmed-save retry focus, validation error association, Edit-to-input focus, and Cancel-to-Edit focus remain separate follow-ups.

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