Fix collapse functionality bugs: CSS selectors, height parsing, and toggle bar creation (#300)

* Initial plan

* Initial analysis - understand collapse-## styling issue

Co-authored-by: mmcky <[email protected]>

* Fix collapse-## styling by removing hardcoded height

Remove hardcoded height: 22.4rem from collapse CSS to allow JavaScript dynamic height control based on tag_collapse-## class names.

Co-authored-by: mmcky <[email protected]>

* Implement single bottom bar collapse toggle for better UX

Replace separate "Show more/Show less" toggle links with integrated clickable bar at bottom of code cells. Maintains dynamic height control while providing more intuitive expand/collapse interaction.

Co-authored-by: mmcky <[email protected]>

* Relax Python version requirement from 3.13 to >=3.12 and update test matrix

Co-authored-by: mmcky <[email protected]>

* fix trim white space pre-commit

* Fix collapse functionality - correct CSS selectors and height parsing logic

Co-authored-by: mmcky <[email protected]>

* Simplify collapse button text and add scroll behavior when collapsing

Co-authored-by: mmcky <[email protected]>

* fix: pre-commit

* Improve collapse scroll behavior with better timing and comments

Co-authored-by: mmcky <[email protected]>

* Make collapse button text bold for better visibility

Co-authored-by: mmcky <[email protected]>

* fix pre-commit

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: mmcky <[email protected]>
Co-authored-by: mmcky <[email protected]>
Co-authored-by: Matt McKay <[email protected]>

Author: Copilot

.github/workflows/tests.yml

@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.13"]
+        python-version: ["3.12", "3.13"]
         # Only test the latest major release of Sphinx because otherwise we need to
         # keep multiple versions of regression tests on file and this creates lots of
         # noise in the tests.
@@ -48,7 +48,7 @@ jobs:
         pytest --durations=10 --cov=quantecon_book_theme --cov-report=xml --cov-report=term-missing
 
     - name: Upload to Codecov
-      if: matrix.os == 'ubuntu-latest' && matrix.python-version == 3.13 && github.repository == 'QuantEcon/quantecon-book-theme' && github.event_name == 'pull_request'
+      if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.13' && github.repository == 'QuantEcon/quantecon-book-theme' && github.event_name == 'pull_request'
       uses: codecov/[email protected]
       with:
         name: ebp-qbt-pytests-py3.13