Add note about image resizing for preview dimension requirements

[jsuar]

Proposed change

Added a note to the Slack integration documentation about Slack’s minimum dimension requirements (800w x 400h) for preview images, clarifying that images not meeting these requirements will be resized automatically.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: home-assistant/core#132451
• This PR fixes or closes issue: none

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

Summary by CodeRabbit

• Documentation
  • Updated Slack integration documentation with details about automatic image resizing for preview images that do not meet minimum dimension requirements.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request introduces an additional documentation note for the Slack integration, specifically addressing image dimension requirements. The new information clarifies that images not meeting the minimum size requirements will be automatically resized when sent via Slack messages. This update enhances user understanding of how images are handled during the integration process.

Changes

File	Change Summary
source/_integrations/slack.markdown	Added a note explaining automatic image resizing when dimensions do not meet Slack's requirements

Note: No functional changes were made to the code or integration logic, only documentation was updated.

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 69ccc92 and c0132e8.

📒 Files selected for processing (1)

• source/_integrations/slack.markdown (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• source/_integrations/slack.markdown

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[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[frenck]

✅ Approved. Can be merged as soon as the parent PR gets merged.