Drag-and-drop images, zoom images, Pygments support in Markdown, new TreeMap experience

This release contains the following enhancements:

1) Users can now drag and drop images into text fields, or paste them
from the clipboard. StrictDoc uploads each image to the document's
assets folder and inserts the reference automatically.

• StrictDoc supports PNG, JPEG, GIF, SVG, WebP, and AVIF. StrictDoc
  rejects any other file and shows a dismissible notification.
• Multiple files upload together. Each file keeps its placeholder at its
  original position. A failed or slow upload does not block the other uploads.
• The strictdoc manage assets command now discovers orphaned image
  files within the project's configured include and exclude paths, and
  can delete them with --clean-unused-images.

2) Users can now zoom images and Mermaid/PlantUML diagrams in
documents. Clicking one opens a full-viewport overlay with:

• cursor-anchored wheel zoom
• Space+drag or arrow-key panning
• a double-click fit/100% toggle.

3) Pygments now syntax-highlights Markdown fenced code blocks, matching
the existing RST highlighting. Code-block styling now matches between
RST and Markdown output. A code block also shrinks its own font size to
fit narrow layouts instead of wrapping.

4) A new, native interactive tree map screen replaces StrictDoc's
Plotly-based tree map. The new screen adds:

• a zoomable, pannable canvas
• breadcrumb navigation
• per-node descriptions and legends
• a view state that persists in the URL, so a link reproduces the same
  zoom level and selection.

5) Fixed several race conditions in the table screen's inline cell
editing. A save still in flight could:

• drop a correction typed in the meantime
• leave a stale validation error on screen
• revert the document's TITLE/UID/VERSION/CLASSIFICATION/PREFIX fields
  when a user saved only a custom metadata row.

6) Fixed: StrictDoc now reports a worker-process exception during
export with its real error message, instead of a confusing
BrokenProcessPool crash.

7) Fixed: long tokens in the table of contents now wrap instead of
overflowing.

8) Added a project configuration option to disable the SSL certificate
check during export.

---

What's Changed

• Add option to disable SSL certificate check by @pmo73 in #3166
• chore: bump pypdf from 6.15.0 to 6.16.1 by @dependabot[bot] in #3168
• chore: bump github/codeql-action from 4.37.8 to 4.37.9 in the github-actions group by @dependabot[bot] in #3171
• fix(tests/end2end): try to fix flaky edit_table_cell_single_choice by @stanislaw in #3175
• fix(backend/markdown): populate the node location correctly by @stanislaw in #3176
• fix(markdown): fix recognition of root-level TEXT node with meta information by @stanislaw in #3178
• fix(markdown): simplify the behavior of TEXT node statement write-back by @stanislaw in #3179
• Fix: fix several races revealed by flaky e2e tests by @stanislaw in #3180
• Feature: Add interactive HTML tree map screen by @mettta in #3172
• fix(features/table): fix(features/table): stop losing inline-cell corrections made before a save responds by @mettta in #3184
• fix(features/table): scope the retry-vs-skip check to a cell's own fields by @mettta in #3185
• refactor: unify toggle-switch implementations into a shared component by @mettta in #3183
• fix(tests/end2end): try fix flaky test edit_table_document_custom_meta_value_validation by @stanislaw in #3181
• fix(tests/end2end): verify the cancel-during-fetch fix and drop redundant waits by @mettta in #3186
• fix(table): stop metadata saves from reverting document fields by @mettta in #3189
• fix(tests/end2end): scroll into view before copy-to-clipboard hover by @mettta in #3190
• fix(table): fix a stale-response race that drops active cell tracking by @mettta in #3191
• feat(media_zoom): zoom oversized images and diagrams in documents by @mettta in #3182
• feat(markdown): highlight fenced code blocks with Pygments by @mettta in #3193
• feat(export/html): auto-shrink code-block font size to fit width by @mettta in #3194
• fix(export/html): scope inline-size containment to sdoc-node fields by @mettta in #3196
• fix(table-view-edit): close two stale-response races in inline editing by @stanislaw in #3198
• Fix TOC and tree-map styling by @mettta in #3200
• fix: ExceptionInfo becomes unpicklable for custom exceptions, masking real errors as BrokenProcessPool crashes by @stanislaw in #3201
• docs: update release notes by @stanislaw in #3202
• feat(server): add support for drag-drop image upload (groundwork) by @stanislaw in #3155
• feat: update to latest html2pdf4doc dependency by @stanislaw in #3203
• refactor: clean up a few Python details after the image upload PR by @stanislaw in #3204
• fix(document_meta): fix link resolution for level 0 document nodes by @stanislaw in #3206
• chore(developer): add ste, technical-writing-guide, crystal skills by @stanislaw in #3207
• Fix: fix one flaky test and one real code issue revealed by another flaky test by @stanislaw in #3208
• release: bump version to 0.30.0 by @stanislaw in #3205
• docs: update release notes (version bump) by @stanislaw in #3209

New Contributors

• @pmo73 made their first contribution in #3166

Full Changelog: 0.29.0...0.30.0