Som Ramnani - refactor(KIInventory): fix buttons in KIInventory

[somramnani]

Related PRS (if any):

This frontend PR is related to the PR#5318

This backend PR is related to PR#2267

Main changes explained:

• Update KIInventory.jsx to open the Add Item modal from the + Add Item button.
• Create KIAddItemModal for the Add Item form, validation, and submit flow.
• Add modal CSS for light/dark mode and responsive layout.
• Update inventory actions/constants/reducer for Add Item API state.
• Add focused tests for the Add Item button and modal behavior.

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. log as admin user
5. go to: /kitchenandinventory/inventory
6. verify function “A” (feel free to include screenshot here)
7. verify this new feature works in dark mode

Screenshots or videos of changes:

Coming soon

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[beblicarl]

This functionality works as intended and the code is great

https://www.loom.com/share/e7f792ef75e24e0cb8d4bc4f122563d7

[sonarqubecloud]

Quality Gate passed

Issues
11 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud