Add scroll targets and fix search index labels for settings search

[gordolio]

Part 3 of #1095

• Replace .listRowBackground(Color.chart) with .settingsSearchTarget(label:) on 7 User Interface sections so they become scroll targets for search
• Add .settingsHighlightScroll() to User Interface screen
• Add scrollTargetLabels mappings for Units/Limits, SMB, Target Behavior, Additionals, and User interface
• Fix incorrect searchContents in Bolus Calculator and User Interface

About scrollTargetLabels

scrollTargetLabels maps the search term to the actual UI label:

scrollTargetLabels: [
    "Max IOB": "Maximum Insulin on Board (IOB)",
    "Max Bolus": "Maximum Bolus",
]

There are two cases where these are needed:

1. Abbreviated search terms - the search result/index uses a shorter/common name but the label within the UI shows the full name (e.g. "Max Basal" → "Maximum Basal Rate")
2. Multiple search terms targeting one section - several terms scroll to the same UI element

• "Dark Mode", "Light Mode", and "Appearance" all scroll to the Appearance picker
• "Cone" and "Lines" both scroll to the "Forecast Display Type"

[dnzxy]

All the labeling changes in this file are breaking localization for our settings search terms, i.e. before this change you were able to search a localized setting name or an English one, and it would list the localized result. Now it lists the hardcoded label as of the collections that were added here.

Example:
-> Working

-> Broken (see English items here)

[gordolio]

Thanks for flagging the localization concern! I investigated and found that the untranslated search results ("Enable SMB With Temporary Target", "Allow SMB With High Temporary Target", "Max UAM SMB Basal Minutes", "Max Allowed Glucose Rise for SMB") are actually a pre-existing issue on dev. These strings were never added to the xcstrings file when they were introduced.

Here's the same "SMB" search on dev:

I had initially included some additional searchContents entries but have since removed them to keep this PR scoped strictly to scrollTargetLabels mappings and scroll target modifiers.

[dnzxy]

Sorry, but shouldn't the color be retained, and the settings search target modifier be added here?

[gordolio]

The .settingsSearchTarget(label:) modifier includes .listRowBackground(Color.chart) as its base, with the highlight overlay on top. So the color is retained.