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Bump language-directory to 0.0.26, and make the default program swap (#4402)

Two halves of one bug: switching from Python to Source left Python's
`# Type your program in here!` sitting in a JavaScript editor.

1. Source had no defaultProgram at all, so the swap never fired for it.
   Fixed in language-directory#63 and picked up by this bump to 0.0.26.

2. The guard only replaced the editor when it held the *pristine*
   defaultEditorValue:

     if (editorValue === defaultEditorValue)

   so the swap was one-shot. The first switch replaced that value with,
   say, Python's comment, and every later switch then failed the
   comparison and silently kept the previous language's text. The bump
   alone therefore fixed nothing — verified in the browser before and
   after.

An untouched default now means the pristine value *or* any language's
own defaultProgram, so switching works every time while still never
clobbering code the student has written.

Verified in the browser end to end, on a cleared localStorage: Python §1
shows `#`, switching to Source §1 gives `//`, and switching back gives
`#` again — the round trip the old guard could not do.

Mutation-verified: restoring the old comparison fails the new test.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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