Closes #996
## What changed
- replaces the eager workspace script with a single-flight feature bootstrap
- keeps the shell visible with actionable load-failure status
- warms the workspace through the failure-isolated optional offline cache
- gates Home → Insights → Home at 320px and 390px in the packaged browser release
## Verification
- RED: 4 focused failures before implementation
- focused bootstrap/bundle tests: 5 passed
- packaged mobile browser journey: 2 passed
- full suite: 1881 passed, 7 skipped
- parser-blocking scripts: 1; core gzip: 101266 bytes
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Closes #996
What changed
Verification