* FEATURE: simplify streaming implementation - rush last update

Previous to this change we would simply "flash" the final update
on the screen, this amends it so we quickly update the UI in about
1 second in the end with all the final update.

This makes the UI feel more interactive to end users.

* DEV: Updates...

- Remove unnecessary comments
- Add doc style comments for all methods
- Organize methods (private at bottom)
- Update some variable names

---------

Co-authored-by: Keegan George <kgeorge13@gmail.com>

Follow-up to 59d6e2b

* FEATURE: support upload.getUrl in custom tools

Some tools need to share images with an API. A common pattern
is for APIs to expect a URL.

This allows converting upload://123123 to a proper CDN friendly
URL from within a custom tool

* no support for secure uploads, so be explicit about it.

Previous to this change, enum was set to [] which broke all non
enum tools

This update includes a variety of small refinements to the AI composer helper:

- prevent height jump when going from loading text placeholder → proofreading text streaming
- update padding on AI helper options list to be more suitable with typical Discourse menu design
- for composer helper results that are not `showResultAsDiff` (i.e. translation):
   - update before/after diff design to be more subtle
   - results should be in normal font (as the text is cooked and not raw markdown)
- fix: smooth streaming animation stuck showing dot icon even after smooth streaming is done

## 🔍 Overview

When exporting an Overall Sentiment report in the admin panel, the export fails with:

```ruby
Job exception: no implicit conversion of Symbol into Integer
```

This was happening because we are passing a single _Hash_ to `report.data` however, exports expect `report.data` to be an _Array of Hashes_. This update fixes this issue by wrapping the data in an array.

This is showing as the most expensive CSS selector in Discourse at the moment. Adding specific classes and dropping the general `span` selector will make this much cheaper.