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## I have read the [CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md) file. YES ## What kind of change does this PR introduce? Refactor, plus one bug fix. Groundwork for showing the user a preview of what they are approving when the AI Assistant creates or edits a notebook. No UI in this PR. Towards FE-4143 ## What is the current behavior? `applyNotebookOperations` resolves an ordered list of notebook operations into the resulting cells and nothing else. Rendering a diff for the approval gate needs to know *what happened* to each cell position, not just where things landed, so there is no way to build the preview on top of it. Separately, replacing a cell dropped its id, so `[replace cell-2, insert after cell-2]` failed with a spurious `unknown_cell_id`. ## What is the new behavior? `deriveNotebookDiff` resolves operations into one annotated entry per cell position (`unchanged`, `added`, `removed`, `replaced`, `moved`). `applyNotebookOperations` becomes a thin projection over its result, so there is a single interpreter of notebook operations and the diff a user approves cannot disagree with the cells that get written. The pre-existing tests pass untouched, which is the evidence that the projection is faithful. Notes on the annotations: - `removed` entries stay in the position the cell used to hold so the list reads as a diff. This does not perturb insert-anchor arithmetic: prior inserts still sit contiguously after their anchor. - Moves that cancel out are downgraded to `unchanged`, since two moves can anchor on each other and leave every cell where it started. Badging those as moved would make the preview lie. - `fromIndex` is the cell's position in the original notebook rather than in the shifted working order, so `was #3` means what a reader expects. A replaced cell now stays addressable as an anchor. Anchoring and targeting are separate lookups: a replaced cell can be anchored on, but is never a legitimate target. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Notebook changes now provide a structured view of added, removed, replaced, moved, and unchanged cells. * Replaced cells can be used as insertion anchors, while invalid or duplicate targets are rejected. * No-op moves are handled as unchanged cells. * Notebook edits preserve operation ordering and original cell positions for more predictable results. * **Bug Fixes** * Improved notebook operation handling and error reporting for complex cell edits. <!-- end of auto-generated comment: release notes by coderabbit.ai -->