Improve changelog sheet dismissal controls

[dillweed]

Adds a persistent top Close control to the changelog sheet while keeping the existing bottom Close button, so users can dismiss long changelog content without scrolling to the end.

Summary by CodeRabbit

• Bug Fixes
  • Improved changelog view navigation by adding a persistent Close button at the top of the sheet, making it easier to dismiss while maintaining the existing bottom Close button.

[coderabbitai]

📝 Walkthrough

Walkthrough

Changes improve the changelog sheet dismissal by adding a persistent top Close button in the navigation bar while retaining the existing bottom Close button. The ChangelogView is wrapped in a NavigationStack, and the title is moved from explicit text to a navigationTitle modifier.

Changes

Cohort / File(s)	Summary
Changelog Sheet Enhancement Hex/Features/Settings/ChangelogView.swift, Hex/Features/Settings/AboutView.swift	Removed top "Changelog" title, added navigationTitle modifier, and introduced a toolbar-based Close button for persistent top dismissal. ChangelogView is now wrapped in NavigationStack within the sheet presentation.
Changelog Entry .changeset/40f4ab66.md	Added patch-level changelog entry for "hex-app" documenting the improvement to changelog sheet dismissal with persistent top Close control.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A changelog now sits with buttons so neat,
Top and bottom, dismissal complete!
NavigationStack keeps the structure tight,
Close buttons await, both left and right! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly describes the main change: adding a persistent top Close control to improve changelog sheet dismissal, which aligns with the changeset modifications and PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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[coderabbitai]

🧹 Nitpick comments (1)

.changeset/40f4ab66.md (1)

5-5: Include the PR number in the changeset summary.

Per coding guidelines, changeset summaries should include the GitHub issue/PR number in the format (#177).

Suggested fix

-Improve changelog sheet dismissal by adding a persistent top Close control while keeping the bottom Close button
+Improve changelog sheet dismissal by adding a persistent top Close control while keeping the bottom Close button (`#177`)

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In @.changeset/40f4ab66.md at line 5, Update the changeset summary string
"Improve changelog sheet dismissal by adding a persistent top Close control
while keeping the bottom Close button" to append the PR number in the required
format (e.g. add " (`#177`)") so the summary includes the GitHub PR reference;
edit the single-line summary in .changeset/40f4ab66.md to include the PR number
immediately following the text.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In @.changeset/40f4ab66.md:
- Line 5: Update the changeset summary string "Improve changelog sheet dismissal
by adding a persistent top Close control while keeping the bottom Close button"
to append the PR number in the required format (e.g. add " (`#177`)") so the
summary includes the GitHub PR reference; edit the single-line summary in
.changeset/40f4ab66.md to include the PR number immediately following the text.

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ℹ️ Review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between f29125d and 14e0ed9.

📒 Files selected for processing (3)

• .changeset/40f4ab66.md
• Hex/Features/Settings/AboutView.swift
• Hex/Features/Settings/ChangelogView.swift