Fixes scroll markers z-index issues

Refs #2537

- Can switch between Editor (default) and Panel layouts
 - Panel layout adds an additional Commit Graph Details view (similar to Commit Details) on the right side of the Commit Graph

Avoids await chains & unneeded function creations

* Add graph header context menu option to toggle mode

* Updates graph dependency

Closes #2252
Closes #2448
Follow-up to 5f95876a97

Ensures an update if subscription changed while hidden

Reworks webview registration
 - Splits out resolver from descriptor
 - Allows for more accurate typings

- disables "switch to branch" when on the current branch
- disables "open worktree" when already in it

- Renames `onDidChangeOther` to `onDidChangeAny` for accuracy
 - Removes `onDidChangeBeforeOverrides` as its unneeded (use `onDidChangeAny` instead)
Consolidates to `onDidChangeAny` where possible