c3999b9af7
User wanted the Notes top bar to truly stay pinned (فريز / ثابت) while scrolling, and wanted the "اكتب ملاحظة..." composer to live at the top of the page above the folders area instead of being tucked under the folders chips and only showing inside a folder. Changes (artifacts/tx-os/src/pages/notes.tsx): - Header bar switched from `sticky top-0` to `fixed top-0 inset-x-0 z-30`. Measured its live height with a `ResizeObserver` + `offsetHeight` (header wraps differently per tab / label set / viewport width), and rendered a same-height aria-hidden spacer immediately below so the first row of content never slides under the bar. - Composer was lifted out of the in-folder branch and is now rendered as the first content block under the spacer (above FoldersRail and FoldersBrowser) on the active "My Notes" view. It is hidden on Inbox, Sent, Archived, and the Shared-with-me read-only folder view, so the read-only contract from Task #445 stays intact. `folderSelection` is still passed in unchanged, so a new note created from this top composer continues to land in the currently-selected folder (or Unfiled if none). - Removed the duplicate Composer mount inside the per-folder branch and left a comment explaining the move. Notes: - No backend or i18n changes — composer placeholder, search input, tabs, label chips and grid/list toggle all kept their existing markup and behavior. - Pre-existing TS errors in artifacts/api-server/src/routes/executive-meetings.ts remain (out of scope) and the `test` workflow continues to fail for that unrelated reason.