Media with early colons is counted as URL protocol

[Minion3665]

Bug description

I am using johnny.decimal to name pages, except I foolishly decided that colons look better than blank spaces so I end up with page names like S01: Skyler Grey/40-49: Travel/41: Leisure/S01.41+2024-10: USA trip

Fine, great, pages work fine... except when uploading images. If I drag and drop an image into the page, it doesn't display at all, like this:

Enregistrement d'écran_20241120_115658.webm
(as demonstrated you can refresh the page/etc. with no change)

If you remove the exclamation mark and try to click on the URL, you instead get a dialog asking you if you want to let your silverbullet instance open the page with a handler for the "protocol" before the colon ('scuse my French, this says "Allow https://silverbullet.starrysky.fyi to open this s01 URL with system handler")

As a workaround, you can add ./ to the front of the URL, although this does make the URL display as if it doesn't exist:
Enregistrement d'écran_20241120_120402.webm

You can also get away with this if you have a slash in the URL before the colon. For example, if the space were called Skyler Grey/S01: Personal instead this doesn't occur

Reproduction steps

• Call a page S01: Foo/Bar. This has to be at the top of your workspace (you can't have Baz/S01: Foo/Bar)
• Drag and drop an image onto the page

Actual outcome

• The image isn't displayed

Expected outcome

• The image should be displayed even if the first part of the page name contains a colon

Versions

Silverbullet Version: Occurs on both 0.9.4 and 0.10.1
Browser Version: Occurs on both Firefox 132.0.1 and Chromium 130.0.6723.116
Sync or online mode: Occurs on both