* feat: add bulk extension field updates with UNSET_VALUE sentinel for key deletion
- Add `UNSET_VALUE` sentinel constant to signal complete field removal from character cards
- Add `writeExtensionFieldBulk()` function to update extension fields across multiple characters in a single API call
- Add `deleteValueByPath()` utility function to remove nested object keys by dot-path
- Update `writeExtensionField()` to support `UNSET_VALUE` for deleting extension keys
- Extend `/api/characters/merge-attributes
* Revert package-lock.json changes
* Allow null values in merge-attributes filter path validation
Change filter.path existence check to only skip on undefined, not null. This allows merging attributes when the existing value is explicitly null, treating null as a valid value rather than absence of a value.
* fix: share forbiddenRegExp between modules
* feat: add writeExtensionFieldBulk and UNSET_VALUE constant to getContext
* Update src/endpoints/characters.js
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
* fix: validate for .png extension
* Update public/scripts/extensions.js
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
* refactor: extract shouldSkip logic as a function param to avoid double parsing
---------
Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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