docs: slack docs copy updates

[RomneyDa]

Description

Copy updates for Slack App compliance

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Tests

[ What tests were added or updated to ensure the changes work as expected? ]

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Summary by cubic

Update Slack integration docs for Slack App compliance and clearer messaging. Renames pages/links, adds a safety disclaimer with a privacy policy link, and fixes routes.

• Renamed “Slack Agent” to “Agent for Slack” and updated copy across pages.
• Updated nav links and redirects from /slack-agent to /slack.
• Clarified connection/disconnection wording and support notes.

^{Written for commit 53c75ff. Summary will update on new commits.}

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Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ (RomneyDa)[https://github.com/RomneyDa]
❌ @dallin Romney
Dallin Romney seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

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✅ Review Complete

Code Review Summary

⚠️ AI review failed. Please check the Continue API key and configuration.

Troubleshooting

• Verify the CONTINUE_API_KEY secret is set correctly
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[cubic-dev-ai]

No issues found across 4 files

[RomneyDa]

commit/cla issues, closing in favor of https://github.com/continuedev/continue/pull/9457/files