Launchpad UX Improvements

[justinrobots]

For Draft PRs:

• [x] #3654
• [x] #3655

For "Other" section:

• [ ] Sort PRs to put current user's PRs at the top of the list
• [ ] Add a visual separator between user's "Other" PRs and collaborators' PRs

In Launchpad item detail menu:

• [x] Rename "Switch to Branch on Worktree" option to "Switch to Branch", since there is an option to open on a worktree in this flow
• [ ] Pin and Snooze icon buttons should be in the item header

[axosoft-ramint]

Removing "add option to search all PRs" and "add option to start work" because these are separate top-level issues

[github-actions[bot]]

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