Webhook payloads (`message_created`, `message_updated`) started sending
channel-rendered HTML in the `content` field instead of the original raw
message content after PR #12878. This broke downstream agent bots and
integrations that expected plain text or markdown.
Closes https://linear.app/chatwoot/issue/PLA-109/webhook-payloads-send-channel-rendered-html-instead-of-raw-content
## How to reproduce
1. Connect an agent bot to a WebWidget inbox
2. Send a message with markdown formatting (e.g. `**bold**`) from the
widget
3. Observe the agent bot webhook payload — `content` field contains
`<p><strong>bold</strong></p>` instead of `**bold**`
## What changed
Split `MessageContentPresenter` into two public methods:
- `outgoing_content` — renders markdown for the target channel (used by
channel delivery services)
- `webhook_content` — returns raw content with CSAT survey URL when
applicable, no markdown rendering (used by `webhook_data`)
Updated `Message#webhook_data` to use `webhook_content` instead of
`outgoing_content`.
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
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