feat: Inline Hex Color Swatch rendering

Feature Description

Ive buiit a mod to show hex color swatches in a prompt transform and also in some response output.

But, native feed support might be better as then the feed isn't generic and have to resort to a list summary of colors detected.

See: https://github.com/dthyresson/hex-color-swatch-mod

Use Case

Some examples ...

What it does

Two jobs, nothing else:

1. Inline swatches in your input

When you type a hex color like #fefefe, the prompt is transformed before
the model sees it — each color becomes a 2-wide solid box painted the actual
color, inline:

type:    use #fefefe and #0af for the theme
becomes: use ██ #fefefe and ██ #0af for the theme

The model sees the annotated color too, so it can reason about it.

2. Color list from model output

When the model's reply contains hex colors, the response is not
rewritten or echoed back. Instead, each unique color is extracted and rendered
as a compact list of swatches in the feed:

██ #fefefe ██ #3b82f6 ██ #00aaff

The model's original answer stays exactly as written — the list is just a
visual aid so you can see the colors at a glance.

Example prompts to try

Ask for colors in any of these ways and the mod will render a swatch list
from the reply:

Rainbow

Give me the hex colors of a rainbow

Color variants

Show me 5 shades of blue from dark to light with their hex codes

Gradient builder

Give me a hex gradient from #ff6b6b to #4ecdc4 in 6 steps

Sports team colors

Do a web search for the San Diego Padres' official colors and list their hex codes

Search for the Vegas Golden Knights' team colors and show them as hex codes

What are the MLB team colors? List a few teams with their brand hexes

More ideas

Give me the Tailwind 500 palette
What's the hex for bright green?
List 10 material design colors

Shwocase

Seattle Kraken Colors

Gradient

TailwindCSS Colors

Inline Prompt Transform

Additional Context

No response

How important is this to you?

Nice to have

首先检查链接的 hex-color-swatch-mod，并定位 command-code 中的 prompt-transform 和 feed response 入口点。确定输入注释和仅用于响应的 swatch 列表应如何与原生 feed 支持集成。完成的标准是：为 prompt 内联渲染十六进制颜色，将唯一颜色作为模型回复的 feed 辅助信息显示，并保持原始回复不变。