Ensure Content-Type is always provided for js modules

[Lord-Grey]

Summary

🔧 Changed

• Fixes:
  • WebUI - Return a valid Content-Type for static assets to prevent module loading failures

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of web configuration, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated (docs/docs/en)
• Related tests have been updated

PLEASE DON'T FORGET TO ADD YOUR CHANGES TO CHANGELOG.MD

• Yes, CHANGELOG.md is also updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:
Fixes: #1999

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[Copilot]

Pull request overview

Fixes a WebUI bug where static JavaScript modules were served without a valid Content-Type header, causing browsers to block them due to disallowed MIME type. The fix introduces a helper that falls back to text/javascript for .js/.mjs/.cjs files (and application/octet-stream otherwise) when QMimeDatabase fails to resolve a usable MIME type, while preserving the existing QTBUG-97392 workaround for HTML files.

Changes:

• Extracted MIME resolution into a resolveMimeType helper with JS extension fallback and default application/octet-stream.
• Narrowed the QTBUG-97392 HTML workaround to only the affected Qt version ranges.
• Updated CHANGELOG.md with the fix entry and corrected a typo on the prior line.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
libsrc/webserver/StaticFileServing.cpp	Adds resolveMimeType helper providing fallback Content-Type for JS modules and unknown types.
CHANGELOG.md	Adds changelog entry for the fix and corrects "incomptible" → "incompatible".

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