Fix Pad fast type error

[SharonStrats]

Ticket: #21

This should resolve the error we get when typing fast in the pad.

it was tested in solid-panes by changing the files there. I'm not sure how to test now that we don't get the build artifacts.

[Copilot]

Pull request overview

This PR aims to prevent the notepad (“pad”) from getting into a broken state when a user types quickly and upstream updates lag, as described in Issue #21.

Changes:

• Debounces input events before sending PATCH updates to the server.
• Adds limited retry behavior for transient upstream failures (e.g., 502/503).
• Applies various formatting/string-literal cleanups in src/pad.ts.

Comments suppressed due to low confidence (1)

src/pad.ts:391

• xhr is treated as always present, but UpdateManager.update callbacks in this repo are often invoked without an XHR/Response argument (many callsites only use 3 params). The log line and the === 409 check dereference (xhr as any).status without guarding, which will throw on network-level failures where xhr is undefined/null. Please use optional chaining/fallbacks consistently (e.g., derive status once and use it for logging and branching).

          log(
            '    patch FAILED ' +
              (xhr as any).status +
              " for '" +
              old +
              "' -> '" +
              newOne +
              "': " +
              errorBody
          )
          if ((xhr as any).status === 409) {
            // Conflict -  @@ we assume someone else
            setPartStyle(part, 'color: black;  background-color: #fdd;')

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