Show the notice that a transcript was saved under another name in the window too, not only in the log file

[happyarts]

When the transcript cannot be written under its name (it is open in Word, say), save_doc saves it under another name and logs that in red, with a link to the file:

self.logn(t('rescue_saving', file=job.transcript_file), 'error', link=f'file://{job.transcript_file}')

In the window this line never appeared. _append_log_text adds the link's tags to the given ones, tags + self.hyperlink.add(...), and the tag comes as the string 'error'. So 'error' + ['hyper', 'hyper-0'] raised a TypeError, which was caught and written to the log file instead: ERROR: Error updating log_textbox: can only concatenate str (not "list") to str. A job that finishes shows the new name again at the end. For a job that fails or is cancelled, this notice is the only place that says where its partial transcript went.

A single tag given as a string is now wrapped in a list before the link's tags are added. It is the only caller that combines a tag with a link; the others pass none, and those already worked.

tests/test_log_link.py logs a line with a link and the tag 'error', once as a string and once as a list. Both must reach the textbox with the tags ['error', 'hyper', 'hyper-0']. The string case fails on main. Checked with a real textbox too: the line gets all three tags and the link still opens.

One thing you may want to decide: the notice now appears, but in the link's blue, not in the error colour. Tk gives the tag created last priority, and hyper is created after error. self.log_textbox.tag_raise('error') after creating the HyperlinkManager would make it yellow and still underlined. I left that out, since it changes how links look next to error text.

This touches _append_log_text only and merges cleanly with #357, which changes log and logr nearby.

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