Release Version-26.08.0

Another large batch of improvements, many of them developed with substantial
help from the AI assistant Claude: sidebars can now be minimized, "Find
and Replace" can be docked like the other sidebars, right-to-left interface
languages and mixed-direction text are now properly supported, translation
losses across dozens of languages were found and restored, and a long list of
export, layout and stability fixes.

• Sidebars can now be minimized, not only closed (GH #2229).
• Right-to-left interface languages support. Full support requires libfribidi
• Restored translations that had quietly gone missing: (GH #2047).
• Equations exported as PNG (GH #2231) or SVG (GH #2230) now are accessible
  in 3.3.1/3.3.3, respectively.
• Many export improvements.
• Fixed scaled images losing their transparency (GH #2227).
• Evaluating a folded section no longer unfolds (GH #1952).
• "Pop out interactively" on a plot now tells you when gnuplot had trouble
  with it (GH #1973).
• macOS: fixed translation files not reaching the app bundle (GH #1711).
• sum()/product()/lsum no longer wrap a plain summand in spurious
  parentheses, matching Maxima's own terminal output (GH #1536); box() no
  longer gets spurious parentheses around it either (GH #1948).
• Folding/unfolding a section (or "Fold All"/"Unfold All") is now part of
  the undo history (GH #266).
• Fixed wxMaxima losing sync with Maxima's working directory for names
  containing wildcard-like characters or, on Windows, characters outside the
  system codepage; a persistently broken path no longer spams the warning
  on every command (GH #1672).
• Code cell syntax highlighting improvements (GH #898).
• Table of contents: dragging a chapter/section to reorder it now actually
  works (GH #1524).
• Fixed two 32-bit-only bugs(GH #2208); CI now actually runs the tests there too.
• Tagged releases now also attach a .tar.xz source archive with a
  checksum, built reproducibly from the tagged commit (GH #1192).
• Snap: gnuplot's license notice now travels with builds that bundle it.
• --batch/--exit-on-error now actually halts on an unanswerable
  interactive question instead of hanging forever (GH #2178).
• Real tab handling.
• Better ASCII Arts support (#1608).
• New Maxima variable wxdirs exposes wxMaxima's own configuration/data/
  help/locale paths to .mac scripts.
• Windows: the installer/ZIP now bundles the MinGW runtime DLLs it needs to
  start.
• Added "Anonymize Code for Bug Report" to the Help menu (#1339): replaces
  every non-builtin name in the selected code (or, after confirmation, the
  whole document) with a random name, consistently, so a worksheet can be
  shared in a bug report without revealing the original names.
• Reduced the memory footprint of every cell on the worksheet by computing
  line-wrap draw order on demand instead of storing it per cell (#1445).