## Summary
This PR improves performance across the Environment Variables page.
## Changes
### Targeted value loading
- load only the non-secret (environmentId, key) pairs required by the
page. Secret values continue to be redacted in the UI.
### SSR windowing + virtualization
- SSR-render only the first 50 rows
- hydrate those rows
- virtualize the remaining dataset client-side
- search is now URL-driven during SSR, ensuring deep links such as
`?search=DATABASE_URL`
### Lightweight 'Create' flow
- 'Create' page no longer loads the full Environment Variables dataset.
## Results
Large projects no longer render thousands of rows during SSR.
Example (~11k rendered rows):
Metric | Before | After
-- | -- | --
Document size | ~150 MB | ~5 MB
SSR rows | ~11k | 50
Browser DOM rows | Thousands | ~26–38
Chris Arderne