refactor: migrate web Collapsible to @makeplane/propel Collapsible

[codingwolf-at]

Description

Migrates the Collapsible used across issue detail widgets (attachments, links, relations, sub-issues) and the workspace settings members panel (pending invites) from @plane/ui's Collapsible/CollapsibleButton to the published @makeplane/propel Collapsible.

Propel's ready-made Collapsible only exposes trigger/icon/trailing props, with no built-in "action visible only while open" slot the way the old CollapsibleButton did. Each title.tsx was restructured to return just the trigger content (label + count/progress badge), and the corresponding root.tsx now wires the trailing action button directly, gated on open/disabled state to match the previous behavior. content.tsx (per-relation nested collapsibles) and list-group.tsx (grouped sub-issues) were converted the same way, dropping their manual chevron icons in favor of Propel's built-in rotating indicator.

Type of Change

• Code refactoring

Screenshots and Media (if applicable)

Verified all 6 changed surfaces in light and dark, open and closed states

Light	Dark

Test Scenarios

• Issue detail page: expand/collapse Attachments, Links, Relations, and Sub-work items — trailing action icon shows only while open, count/progress badge stays inline with the label
• Relations: nested per-relation-type collapsibles (defaultOpen groups vs. the collapsed "Duplicate of" group)
• Sub-work items grouped list: per-state-group collapse (chevron + count) vs. the "All Issues" ungrouped flat list (no header chrome)
• Workspace Settings → Members: pending invites collapse/expand, count chip
• Light and dark theme for all of the above

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[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit 0373267.}

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