feat(icp): Make ICP details only scrollable

[anujeet98]

Summary

• Fixes UX bug where a long ICP Notes entry caused the entire ICP detail page to scroll, dragging the header, tabs, and filters sidebar out of view.
• The tab-content row is now bound to the viewport height; the Notes/tab-content column and the filters sidebar each scroll independently within their own bounded box.
• The page header (breadcrumb, title, tabs) and the "Notes" sub-label stay pinned in view via sticky positioning while content scrolls beneath them.

Changes

• Frontend (apps/web/src/components/Icp/IcpDetail.tsx):
  • Wrapped the header block in a shrink-0 flex child above a min-h-0 flex-1 content row, with the notes column and filters sidebar each set to self-stretch overflow-y-auto.
  • Made the DetailsPanel's "Notes" label + saving indicator sticky top-0 within the scroll container.
  • Reserved a left-side gutter (-ml-20/pl-20) on the scrollable notes column so EditorJS's block toolbar (+/drag-handle icons, which render slightly outside the block's own box) isn't clipped by the new overflow container.

Test plan

• Verified via Playwright against the local dev server: typed 40+ lines of notes, confirmed window.scrollY stays 0 (no page-level scroll) while the inner container's scrollTop moves.
• Confirmed header, tabs, and filters sidebar remain visible/fixed while notes content scrolls.
• Confirmed the "Notes" label stays pinned above the scrolling editor content.
• Confirmed EditorJS's +/drag-handle toolbar renders fully (not clipped) and is clickable after the scroll-container change.
• tsc --noEmit passes with no errors in the changed file.

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