Update in Canvas moves an item to its file's module

[teichert]

Summary

Moving a file to another module folder and clicking Update in Canvas left the item in its old Canvas module: create put items in a module, update never looked.

• canvasModuleService.placeInModule finds the item's module items with module_item_sequence (works for assignments, quizzes and pages; checked read-only against a real course). It makes the file's module the only one holding the item: keeps or moves (PUT …/items/:id with module_id) one copy into it, adds one if the item is in no module, and deletes any other copies.
• usePlaceInCanvasModule looks the module up by folder name (loading the module list first, so a missing module isn't created twice) and toasts when it moved, added or removed something.
• The assignment, quiz and page update hooks call it; their 8 callers pass moduleName (pages also pass their Canvas url, for the add case).
• Add to Canvas now uses the same lookup (useCanvasModuleIdByName, one addModuleItem), which removes three copies of find-or-create-module. Adding a quiz or page before the module list had loaded used to do nothing.
• The editor footer, Compare with Canvas and the calendar compare the file's module folder with the Canvas modules that hold the item (useCanvasModuleNames, one request for the course's modules with their items). Modules are compared as a set: a moved file, or an item also in another Canvas module, is a difference, so Update in Canvas is the footer's main button. getStatus.tsx was a pass-through to getSyncStatus and is gone.
• Guide: the Publishing bullet and a Recent changes row.

Test plan

• vitest (401), tsc, eslint (0 errors); service tests for already / moved / added / extra copies removed and for pages; sync-report tests for the module row
• Move a quiz's file to another module, Update in Canvas: it moves in Canvas, with a toast
• Update an item that hasn't moved: no module change, no toast
• Against real Canvas: the calendar after the module comparison (how many items newly differ), a page's compare view (Module row), Add to Canvas then In sync

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