fix(input_date): datesdisabled ignored non-default format

[taekop]

fix(input_date): datesdisabled ignored non-default format

Port of rstudio/shiny#4434 (fixes rstudio/shiny#4281) to ui.input_date(). cpsievert asked for this port in the review on rstudio/shiny#4434.

datesdisabled is always yyyy-mm-dd, but it was emitted as data-date-dates-disabled, which bootstrap-datepicker picks up itself and parses with the display format. With any non-default format the dates never matched, so nothing was disabled.

Changes:

• ui.input_date() now emits data-dates-disabled (not data-date-*), so the client binding parses it as yyyy-mm-dd, the same way it handles min/max. The attribute is omitted when datesdisabled is None.
• controller.InputDate.expect_datesdisabled() checks the new attribute (and expects it to be absent for None). The description in the generated testing docs is updated to match.
• Vendored assets are synced in a separate build: commit (first commit), generated with make upgrade-html-deps against rstudio/shiny main at bbc43849, which is the merge commit of fix: dateInput() datesdisabled ignored non-default format (#4281) rstudio/shiny#4434. The shiny JS change in that commit is exactly the #4434 change (13 added lines in shiny.js, plus the regenerated .min.js and source maps). The same run also picked up the current rstudio/bslib main (97aa1abc -> ac1e25f8): bslib/components CSS/JS, page_sidebar.scss, toolbar.scss, and the regenerated bootstrap CSS. The commit totals 16 files, +57/-32.
• Added a pytest test for the rendered attributes and a Playwright test that opens the picker and checks the disabled days for dd/mm/yyyy and mm/dd/yy, and that the value survives a 2-digit-year format.
• CHANGELOG entry.

input_date_range() has no datesdisabled argument (same as dateRangeInput() in R), so nothing changes there.

Testing (local, chromium):

• The new Playwright test fails on main and with only the Python change on top of the old vendored JS ([] == ['1', '2']: no days disabled). It passes with the build: commit.
• tests/pytest: 1226 passed, 6 skipped.
• Existing date-related Playwright tests (input_datepicker, input_daterange, test_input_date, test_input_date_range, test_inputs_update, and the ai_generated_apps input_date / input_date_range core and bookmark apps): 12 passed.
• uv run make format check-lint check-types pass.

testing-documentation.json was edited by hand because make update-testing-docs needs quarto and repomix, which are not available here. It matches what the generator would produce: the description column is the first line of the docstring, and the signature is unchanged.