fix(web): standardize responsive and accessible data tables

[jeanduplessis]

Problem

Organization, billing, BYOK, code-indexing, analytics, and admin tables inconsistently clip, scroll without affordance, omit captions, or provide pointer-only row actions.

Remediation action

Adopt one accessible responsive-table pattern across audited data views.

Representative scope

• apps/web/src/components/organizations/audit-logs/AuditLogsTable.tsx:149
• apps/web/src/app/(app)/credits/page.tsx:53
• apps/web/src/components/organizations/byok/BYOKKeysManager.tsx:486
• apps/web/src/components/code-indexing/CodeIndexingView.tsx:744
• apps/web/src/components/code-indexing/UserCodeIndexingView.tsx:469
• apps/web/src/components/code-reviews/analytics/AnalyticsTables.tsx:209
• apps/web/src/app/admin/components/OrganizationTableBody.tsx:338

Acceptance criteria

• Each table has semantic headers and a caption or accessible region label.
• Wide tables use a keyboard-focusable horizontal overflow region with visible focus and scroll affordance, or a complete stacked mobile representation.
• Row actions remain visible and keyboard operable; rows are not pointer-only controls.
• Default rows meet 48px density and numeric columns use tabular formatting.
• No table causes page-level horizontal overflow at 375px.