* fix(picker): improve provider group header separation in Media model picker
Added min-height and border-bottom to the sticky provider group header
to ensure it fully separates from the model content below.
Fixes#1434
* fix(tools-pack): warn on stale dist in dev/workspace mode
Detect when dist is stale relative to source and emit a warning.
This helps developers notice when they need to rebuild tools-pack
after making changes to tools/pack/src/**.
Fixes#1452
* fix(tools-pack): remove TypeScript annotation and use recursive source mtime check
Addressed review feedback:
- Remove TypeScript annotation from .mjs file (P0)
- Use recursive source file mtime check instead of directory mtime (P1)
Fixes#1452