docs: add AI use declaration

docs/AI decleration.md

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+# AI declaration
+
+We have used AI as an aid during development, mainly to work more efficiently,
+understand errors, and learn more about React. It has been useful for discussing
+possible solutions and explaining concepts, but we have reviewed and adapted
+the suggestions ourselves.
+
+When designing the issue template, we used AI to help format it and make sure
+that it included the details needed for reporting issues. We also used AI while
+working on the search and pagination features. It helped us with ideas and
+implementation suggestions related to React components, state, user input,
+debouncing, and pagination. Working through these suggestions helped us better
+understand how these parts of React fit together.
+
+AI was also used to help with spelling, formatting, and fact-checking parts of
+the sustainability documentation.
+
+AI was used as a support tool rather than a replacement for understanding the
+code. The team remains responsible for reviewing the suggestions and for the
+final implementation and documentation.
+
+## Commit details
+
+- **`89c9079` - Update to YAML issue template (29 September 2026):**
+  AI was used to help format the issue template and check that it contained the
+  information needed when creating an issue. The tool used was
+  `zai-org/GLM-5.3-Flash` through hpc.ntnu.no.
+- **`e3e7e5a` - Search improvements (29 October 2026):** AI assisted with the
+  search and pagination work, including the search settings, debounced input,
+  cursor-based page retrieval, and dynamic page sizes. The tool used was
+  `moonshotai/Kimi-K2.6 @IDUN`. The team reviewed and adapted the resulting
+  implementation.
+- **`ccfc0b3` - Expand sustainability documentation (9 November 2026):**
+  Copilot GPT Luna 5.6 assisted with spelling, formatting, and fact-checking
+  the sustainability documentation. The content and final wording were
+  reviewed by the team.