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Closes #2139 Two related defects let the installed-skills count balloon when users tap the import confirm button multiple times — either deliberately or because the button is still clickable while a slow import is in flight: - The confirm button only disabled itself while `selected.size === 0`, so it stayed clickable during a pending mutation. Each extra click triggered another `importFromApps` mutation. - `useImportSkillsFromApps` appended the server response to the installed cache without deduping, so re-firing the mutation stacked the same skills into the list again. Disable the confirm (and cancel) buttons while the mutation is pending — matching the `isRestoring` / `isDeleting` pattern already used by `RestoreSkillsDialog` — and merge success payloads by `InstalledSkill.id` so repeated results overwrite rather than accumulate. The merge is extracted as a pure `mergeImportedSkills` reducer to make the behaviour unit-testable and to short-circuit on an empty payload, returning the existing reference so React Query does not notify subscribers about a no-op cache update.