chore(core): remove orphan PageTabs + clean post-i18n doc drift

[PierreBrisorgueil]

Summary

• Deletes core.pageTabs.component.{vue,test} — orphan component from PR feat(core): reusable PageTabs component + Account view refactor #4183 abandoned 2h after merge for SurfaceTabBar (PR refactor(ui): homogenize Account, Organization detail, and Admin pages #4187), zero consumers in devkit + downstream
• Updates MIGRATIONS.md — strikethrough + Superseded note on dangling src/lib/plugins/i18n.js reference (file removed in PR chore(i18n): remove vue-i18n entirely — inline English strings #4169), adds drop note grouped with other 2026-05-21 entries
• Fixes 3 stale "fallback to i18n keys" comments in billing.static-content.js with the exact runtime EN defaults (verified against the view template)

Context — audit P1 (2026-05-21)

Devkit audit flagged 3 doc-drift issues left over from i18n removal + abandoned PageTabs work. This PR cleans them all in one chore.

Reviews completed before push :

• In-session spec review : ✅ compliant (4 files exactly as scoped)
• In-session code-quality review : 2 IMPORTANT (MIGRATIONS placement + heading format) + 3 MINOR → fixes in commit f09975cb
• DeepSeek pre-push gate : OK with nits (1 low : sentinel test in user.view.unit.tests.js:150-159 is dead post-deletion ; 1 nit : MIGRATIONS doesn't call out sentinel test for downstream — deferred to follow-up)

Doc-sync ack

• [doc-sync ack] MIGRATIONS.md sentinel test in user.view.unit.tests.js left intact — both reviewers flagged as dead weight, deferring to follow-up issue to keep this PR scope tight

Test plan

• NODE_ENV=devkit npm run lint — clean
• NODE_ENV=devkit npm run test:unit — 1910/1910 tests pass
• grep confirmed zero PageTabs consumers in devkit + 5 downstream repos
• CI green
• CodeRabbit clean

Plan

docs/superpowers/plans/2026-05-21-devkit-audit-p0-p1-fixes.md Phase 3.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 90270981-548b-4132-ade8-46a9e119d2a3

📥 Commits

Reviewing files that changed from the base of the PR and between 6477873 and af4467c.

📒 Files selected for processing (4)

• MIGRATIONS.md
• src/modules/billing/config/billing.static-content.js
• src/modules/core/components/core.pageTabs.component.vue
• src/modules/core/tests/core.pageTabs.component.unit.tests.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/cleanup-dead-pagetabs-doc-drift

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[Copilot]

Pull request overview

This PR removes an unused core tab component introduced in an earlier refactor, and cleans up documentation/comment drift caused by the vue-i18n removal and the subsequent tab-bar consolidation.

Changes:

• Deleted orphan core.pageTabs component and its unit test.
• Updated MIGRATIONS.md to note the removal and to strike/supersede a stale src/lib/plugins/i18n.js reference.
• Updated JSDoc/comments in billing.static-content.js to replace stale “fallback to i18n” wording with English-default behavior notes.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/modules/core/tests/core.pageTabs.component.unit.tests.js	Removes the unit test for the now-deleted orphan core.pageTabs component.
src/modules/core/components/core.pageTabs.component.vue	Deletes the unused CorePageTabs implementation (superseded by CoreSurfaceTabBar).
src/modules/billing/config/billing.static-content.js	Updates doc comments describing runtime fallback behavior after i18n removal.
MIGRATIONS.md	Adds a migration note for dropping core.pageTabs and marks an i18n-plugin reference as superseded.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.56%. Comparing base (6477873) to head (af4467c).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4192   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          31       31           
  Lines        1140     1140           
  Branches      329      329           
=======================================
  Hits         1135     1135           
  Misses          5        5           

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[PierreBrisorgueil]

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