* fix: prevent empty mode names from being saved (fixes#5766)
- Add frontend validation in ModesView to prevent empty names from being saved
- Add onBlur handler to restore original name if field is left empty
- Add backend validation in CustomModesManager.updateCustomMode using modeConfigSchema
- Provide user feedback when validation fails
- Trim whitespace from mode names before validation
This prevents YAML parsing errors caused by empty mode name fields.
* fix: improve UX by allowing users to empty mode name field
- Remove restriction that prevented users from emptying the name field
- Remove onBlur handler that automatically restored original name
- Allow backend validation to handle empty names and show appropriate errors
- Users can now type freely but invalid saves are prevented by backend validation
Addresses feedback from @daniel-lxs in PR #5767
* fix: allow emptying mode name field but prevent saving when invalid
- Modified onBlur handler to check if name is empty before saving
- If empty, revert to original name instead of saving empty value
- This provides better UX as requested in PR review
* fix: add proper JSON formatting to source map writes for Windows compatibility
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Co-authored-by: Roo Code <roomote@roocode.com>
