Provide more helpful error messages for import star and multiple
definition errors, explaining the reasoning behind these errors.

This PR also changes error description text to be muted instead of red,
matching the accordion text, based on feedback that too much red can be
stressful. Headlines (which describe the exception type) are still red
and bold.


![image](https://github.com/user-attachments/assets/ffa54805-596a-4f31-8981-bf62d1568af7)

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Per discussion on Slack, updated the placeholder to make it clear that
the context is only for tables and dataframes for now.

Disables the RTC experimental flag, which often leads to code
duplication. Users can no longer opt-in to RTC on the frontend.

## 📝 Summary

Explicitly catch IOError for notebook on top level serialization I was
tinkering with: https://marimo.app/l/n0s9hn

## 📝 Summary

<!--
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If this PR fixes any issues, list them here by number (e.g., Fixes
#123).
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Not sure what you think about this, but this may be a temporary solution
for the issue here:
https://discord.com/channels/1059888774789730424/1338959377411084390/1344967482577915905.

By default, we do not introspect tables, we let users opt-in by changing
config.

## 🔍 Description of Changes

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problem addressed and how it was resolved. If applicable, provide before
and after comparisons, screenshots, or any relevant details to help
reviewers understand the changes easily.
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For future MRs:
- [ ] ~remove introspection for meta schemas, make this a config.
`information_schema` does not need to be introspected I think..~ (if we
load on-demand, we do not need to do this)
- [ ] possible to request in the background(?) or same as table details
preview, request on-demand.

## 📋 Checklist

- [X] I have read the [contributor
guidelines](https://github.com/marimo-team/marimo/blob/main/CONTRIBUTING.md).
- [ ] For large changes, or changes that affect the public API: this
change was discussed or approved through an issue, on
[Discord](https://marimo.io/discord?ref=pr), or the community
[discussions](https://github.com/marimo-team/marimo/discussions) (Please
provide a link if applicable).
- [ ] I have added tests for the changes made.
- [X] I have run the code and verified that it works as expected.

## 📜 Reviewers

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## 📝 Summary

Follow up to: #3892

This allows eligible cells to automatically and reactively run pytest in
a notebook:


![image](https://github.com/user-attachments/assets/d5040319-7435-4ec4-bfa0-ca12f9b3f93b)

It also hooks into the runtime, so tests don't have to run from scratch

This is currently hidden under an experimental flag for a few reasons:

1. I noticed live editing the cells sometimes puts them in an invalid
state requiring another run (pytest loads the module off disk, and I
think there's a bit of a lag)
2. similar to top level functions, I think that it seems like a bit of
magic for when the functionality turns on. I think some more
documentation and UX communication might be needed before an intentional
release.
3. My unit tests aren't super robust and I haven't tested out every edge
case
4. Would nice to get some feedback before pushing too much further
 
Just a note, this is tightly integrated with pytest, I don't think there
are many other meaningful frameworks now nose is dead, but marimo should
attempt to be agnostic.

## 📜 Reviewers

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@akshayka OR @mscolnick @koaning

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [anywidget](https://redirect.github.com/manzt/anywidget) | `~=0.9.13`
-> `~=0.9.14` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/anywidget/0.9.14?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/anywidget/0.9.13/0.9.14?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>manzt/anywidget (anywidget)</summary>

###
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[Compare
Source](https://redirect.github.com/manzt/anywidget/compare/anywidget@0.9.13...anywidget@0.9.14)

##### Patch Changes

- Comm messages sent quickly after the creation of a widget could be
lost because custom widgets' models were loaded asynchronously
([#&#8203;804](https://redirect.github.com/manzt/anywidget/pull/804))

</details>

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [crate-ci/typos](https://redirect.github.com/crate-ci/typos) | action
| patch | `v1.29.4` -> `v1.29.10` |

---

### Release Notes

<details>
<summary>crate-ci/typos (crate-ci/typos)</summary>

###
[`v1.29.10`](https://redirect.github.com/crate-ci/typos/releases/tag/v1.29.10)

[Compare
Source](https://redirect.github.com/crate-ci/typos/compare/v1.29.9...v1.29.10)

#### \[1.29.10] - 2025-02-25

##### Fixes

-   Also correct `contaminent` as `contaminant`

###
[`v1.29.9`](https://redirect.github.com/crate-ci/typos/releases/tag/v1.29.9)

[Compare
Source](https://redirect.github.com/crate-ci/typos/compare/v1.29.8...v1.29.9)

#### \[1.29.9] - 2025-02-20

##### Fixes

-   *(action)* Correctly get binary for some aarch64 systems

###
[`v1.29.8`](https://redirect.github.com/crate-ci/typos/releases/tag/v1.29.8)

[Compare
Source](https://redirect.github.com/crate-ci/typos/compare/v1.29.7...v1.29.8)

#### \[1.29.8] - 2025-02-19

##### Features

-   Attempt to build Linux aarch64 binaries

###
[`v1.29.7`](https://redirect.github.com/crate-ci/typos/releases/tag/v1.29.7)

[Compare
Source](https://redirect.github.com/crate-ci/typos/compare/v1.29.6...v1.29.7)

#### \[1.29.7] - 2025-02-13

##### Fixes

-   Don't correct `implementors`

###
[`v1.29.6`](https://redirect.github.com/crate-ci/typos/releases/tag/v1.29.6)

[Compare
Source](https://redirect.github.com/crate-ci/typos/compare/v1.29.5...v1.29.6)

#### \[1.29.6] - 2025-02-13

##### Features

- Updated the dictionary with the [January
2025](https://redirect.github.com/crate-ci/typos/issues/1200) changes

###
[`v1.29.5`](https://redirect.github.com/crate-ci/typos/releases/tag/v1.29.5)

[Compare
Source](https://redirect.github.com/crate-ci/typos/compare/v1.29.4...v1.29.5)

#### \[1.29.5] - 2025-01-30

##### Internal

-   Update a dependency

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "* 0-3 1 * *" (UTC), Automerge - At
any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
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🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
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