Toolbar revival

[dmail]

• Reconnect toolbar server indicator to websocket
• Reconnect toolbar autoreload to parentWindow.__reloader__
• Split core and ui (using preact signals)
• More consistency in class names and identifiers
• Few fixes on toolbar, mostly around animations and overlay

[github-actions]

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Error: Error while trying to collect info after merging toolbar_2 into main.

Error: Command failed: git fetch --no-tags --prune origin toolbar_2
fatal: couldn't find remote ref toolbar_2

    at ChildProcess.exithandler (node:child_process:412:12)
    at ChildProcess.emit (node:events:513:28)
    at maybeClose (node:internal/child_process:1091:16)
    at Socket. (node:internal/child_process:449:11)
    at Socket.emit (node:events:513:28)
    at Pipe. (node:net:313:12)

---

_{Generated by @jsenv/file-size-impact during file size impact#3685786043 on a034786}

[github-actions]

---

Error: Error while trying to collect info after merging toolbar_2 into main.

Error: Command failed: git fetch --no-tags --prune origin toolbar_2
fatal: couldn't find remote ref toolbar_2

    at ChildProcess.exithandler (node:child_process:412:12)
    at ChildProcess.emit (node:events:513:28)
    at maybeClose (node:internal/child_process:1091:16)
    at Socket. (node:internal/child_process:449:11)
    at Socket.emit (node:events:513:28)
    at Pipe. (node:net:313:12)

---

_{Generated by @jsenv/performance-impact during performance_impact#3685785600 on a034786}