"attempt to encode a non-existance note route" when moving files

[srid]

File moves (mv foo.md bar/qux/foo.md) can lead to inconsistent internal state, leading to errors like this:

[Debug#WS.Client.10] <~~ ["brazil-cerrado"]
attempt to encode a non-existance note route: Identity R[/2021-09-21.md]
CallStack (from HasCallStack):
  error, called at src/Relude/Debug.hs:218:11 in relude-0.7.0.0-CnCT2EZE7nm5s1uXLlAUNA:Relude.Debug
  error, called at src/Emanote/Route/SiteRoute/Class.hs:90:22 in main:Emanote.Route.SiteRoute.Class
  encodeResourceRoute, called at src/Emanote/Route/SiteRoute/Class.hs:52:11 in main:Emanote.Route.SiteRoute.Class

Originally posted by @srid in #134 (comment)

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Note that the remount suggestion should solve it, but currently remounts happen only on folder events - not "file moves".

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• Gracefully handle the bug trigger avoiding the websocket handler crash
• Fix the bug