…14180)

## Describe your changes

cachetools 7.0.2 changed TTLCache.clear() to an O(1) implementation that
bypasses `popitem()`/`expire()`. That skipped `TTLCleanupCache` release
hooks and broke resource cleanup paths that expect on_release to run for
each entry.

Override `TTLCleanupCache.clear()` to evict entries via `popitem()`,
preserving release semantics across `cachetools` versions. Update
related inline comments in `cache_resource_api` to document the
callback/exception behavior and why per-item cleanup is still used.

## Screenshot or video (only for visual changes)

## GitHub Issue Link (if applicable)

## Testing Plan

- [x] Covered by existing tests

---

**Contribution License Agreement**

By submitting this pull request you agree that all contributions to this
project are made under the Apache 2.0 license.

…#14195)

## Describe your changes

Fixes two issues in layout container state persistence:

- Removes erroneous `block_proto.id = element_id` assignment in
`st.expander` — the ID should only live on `expandable_proto.id`,
matching the pattern used by `st.tabs` and `st.popover`
- Aligns `on_change` default to `"ignore"` across all three stateful
layout containers. `st.tabs` previously used `None` as its default and
accepted `None` as a value; now it uses `"ignore"` consistent with
`st.expander`, `st.popover`, and the [product
spec](../specs/2026-01-14-dynamic-tabs-expander/product-spec.md#new-parameter-on_change)

## GitHub Issue Link (if applicable)

## Testing Plan

- Unit Tests (JS and/or Python)
- Updated existing tests to match corrected behavior (block-level ID not
set on expander, `on_change=None` now raises on tabs).


**Contribution License Agreement**

By submitting this pull request you agree that all contributions to this
project are made under the Apache 2.0 license.

---------

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

## Describe your changes

* Added custom CSS colors to Markdown support
* Added auto-escaping to limited Markdown fields like widget labels
* Added limited Mardown support to `st.Page`, `st.navigation`, 
* Added Markdown support to 
* Unified and expanded the description of `key`
* Unified and clarified query parameter in widgets (that have been
released so far)
* Added support for hidden pages
* Unified docstrings for dynamic containers `st.tabs`, `st.expander`,
and `st.popover`
* Added DeltaGenerator subclasses for dynamic containers (without
mentioning DeltaGenerator) with six new embedded examples for dynamic
containers

## Screenshot or video (only for visual changes)

## GitHub Issue Link (if applicable)

## Testing Plan

- Explanation of why no additional tests are needed
- Unit Tests (JS and/or Python)
- E2E Tests
- Any manual testing needed?

---

**Contribution License Agreement**

By submitting this pull request you agree that all contributions to this
project are made under the Apache 2.0 license.

---------

Co-authored-by: Lukas Masuch <[email protected]>