赵月辉 / fastgpt-migrated

* feat(skill): optimize skill first-use UX and cross-tab associate flow

Add dashboard empty-state guidance, skill selector create redirect,
and cross-tab associate bridge for Agent skill binding after creation.

Co-authored-by: Cursor <cursoragent@cursor.com>

* refactor(skill): normalize root parentId to null and simplify modal/list flow

- Root directory is now uniformly `null`; collapse fetchParentId/parentId in
  useSkillSelectData and drop `?? ''` in skill context (server treats falsy
  parentId as root, so behavior is unchanged).
- Create/Import modals no longer swallow onSuccess errors with a toast;
  callers handle exceptions and list refresh becomes best-effort.
- Drop redundant redirectToDetail in CreateSkillModal; openDetailInNewTab
  fully controls new-tab vs current-page navigation.
- Extract passesSandboxGuard helper in skill List.
- Dedupe the shared glow-ellipse/filter geometry in SkillEmptyActionCard.

refactor(skill): remove unused skill association logic and clean up related components

chore(skill): update submodule and remove unused SVG assets

- Updated submodule reference in `pro`.
- Deleted unused SVG files related to skill selection and import functionality, including `createCardBgDefault.svg`, `createCardBgHover.svg`, `importCardBgDefault.svg`, `importCardBgHover.svg`, and `skillSelectEmptyIcon.svg`.
- Refactored `SkillSelectModal` and related components to streamline button actions and improve code clarity.

refactor(skill): simplify EmptyTip component and update SkillSelectModal logic

* feat(skill): implement skill import size validation and enhance user feedback

* refactor(skill): simplify empty card glow effect and import size check

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Co-authored-by: siigure <siiigureouo@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>