Configure textream.net as the canonical domain

[f]

Summary

• configure GitHub Pages for textream.net
• update public privacy, support, marketing, and in-app policy URLs
• use textream.net as the generated Homebrew cask homepage

Verification

• AppStore configuration builds successfully with code signing disabled
• git diff --check passes
• bundle identifiers and app identifiers are unchanged

Prepared and reviewed with Codex assistance.

[Copilot]

Pull request overview

Configures textream.net to be the canonical public domain for Textream by adding the GitHub Pages custom domain (CNAME) and updating user-facing links across the app, repository docs, App Store metadata, and the generated Homebrew cask.

Changes:

• Added docs/CNAME to set textream.net as the GitHub Pages custom domain.
• Updated privacy/support/marketing URLs to https://textream.net/... in the app UI, README, and App Store metadata.
• Updated the Homebrew cask homepage to https://textream.net/ in the release workflow.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Textream/Textream/ContentView.swift	Updates in-app Privacy link to point at textream.net.
README.md	Updates README Privacy/Support links to textream.net.
docs/CNAME	Sets GitHub Pages custom domain to textream.net.
app-store/metadata/en-US/support_url.txt	Updates App Store Support URL to textream.net/support.html.
app-store/metadata/en-US/privacy_url.txt	Updates App Store Privacy URL to textream.net/privacy.html.
app-store/metadata/en-US/marketing_url.txt	Updates App Store Marketing URL to https://textream.net/.
app-store/app-privacy.md	Updates the privacy policy URL reference in the App Store questionnaire draft.
.github/workflows/release.yml	Updates the generated Homebrew cask homepage to https://textream.net/.

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