feat: add automatic skeleton rows to Table

[gethinwebster]

Adds automatic skeleton-row sizing to Table via skeleton={{ totalRows: 'auto' }}: during loading the table fills its available viewport with placeholder rows, and a post-render correction removes rows if the rendered page would overflow (never below one row).

Changes

• Automatic skeleton rows in use-auto-skeleton-rows.ts, wired through Table internals and interfaces.
• Unit + browser integration coverage: sticky header, footer, wrapLines on/off with long headers, and mixed data + skeleton rows (data rows always precede skeleton rows).
• AppLayout console-shell dev pages (#/light/app-layout/auto-skeleton-table, ...-nowrap) with an external #h header and #f footer, matching a real console layout.

Testing

• npm run build, npm run lint, and the table unit suites (17/17) pass.
• Browser integration tests run in CI.
• Row-count oscillation risk was investigated with a real headless-Chrome probe (forced overflow, container churn, seed-height mismatch) — no oscillation and no ResizeObserver-loop warnings.

[codecov]

Codecov Report

❌ Patch coverage is 98.80952% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.61%. Comparing base (f97729a) to head (95c275f).

Files with missing lines	Patch %	Lines
src/table/use-auto-skeleton-rows.ts	98.41%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4772   +/-   ##
=======================================
  Coverage   97.61%   97.61%           
=======================================
  Files         952      953    +1     
  Lines       30816    30897   +81     
  Branches    11318    11338   +20     
=======================================
+ Hits        30081    30161   +80     
- Misses        688      689    +1     
  Partials       47       47           

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