Missing "p-clickable" class in MultiSelect trigger icon

Describe the bug

Describe the issue
The p-clickable class seems to be missing in the MultiSelect trigger icon (and possibly in other interactive elements).

Additional context
If this is intentional, could you clarify in the documentation? Otherwise, please consider adding p-clickable back for consistency.

Reproducer

https://stackblitz.com/edit/vitejs-vite-sioduxog?file=src%2Findex.css

System Information

System:
    OS: macOS 14.5
    CPU: (11) arm64 Apple M3 Pro
    Memory: 77.70 MB / 18.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.5.1 - /opt/homebrew/bin/node
    npm: 10.8.2 - /opt/homebrew/bin/npm
  Browsers:
    Chrome: 139.0.7258.139
    Edge: 139.0.3405.102
    Safari: 17.5

Steps to reproduce the behavior

1. Use the MultiSelect component
2. Inspect the trigger icon element
3. Notice that p-clickable is not applied

Expected behavior

All interactive elements (e.g. icons that trigger actions) should include the p-clickable class for consistency and expected behavior (cursor pointer, etc.).

Start with the MultiSelect component's trigger icon implementation and use the linked StackBlitz reproducer, whose stylesheet is src/index.css, to observe the missing class. Confirm the expected behavior for the trigger icon and other interactive elements; the work is done when the intended elements consistently render with p-clickable or the documentation explains why they do not.