De-emphasize "Visit OpenStreetMap" link and add prominent login button on Account page

[Copilot]

Users were confused by the full-width OutlinedButton for "Visit OpenStreetMap" outshining the actual login affordance (a ListTile), leading them to click the wrong element when trying to log in.

Changes

• Login CTA: When logged out, renders a full-width FilledButton.icon (Material 3 highest-emphasis) below the status ListTile, making the login action unambiguous
• Visit OSM link: Replaced the full-width OutlinedButton.icon with a compact inline TextButton.icon (shrink-wrapped, small padding) — visually reads as a secondary reference link, not a primary action

// Before — visually dominant
SizedBox(
  width: double.infinity,
  child: OutlinedButton.icon(..., label: Text('Visit OpenStreetMap')),
)

// After — inline secondary link
TextButton.icon(
  ...,
  style: TextButton.styleFrom(
    padding: const EdgeInsets.symmetric(horizontal: 4),
    tapTargetSize: MaterialTapTargetSize.shrinkWrap,
  ),
)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Alter or remove "Visit OpenStreetMap" button on Account page in settings</issue_title>
<issue_description>Multiple people have written in confused about how to log in. After some back and forth I determined in both cases that it was the very obvious "Visit OpenStreetMap" button on the Account page tripping them up. It is visually more obvious than the Login button at the top.
Either remove, or make it less "click here!" looking.</issue_description>

<agent_instructions>Investigate the issue and see what you can do with this. Make the login more obvious and de-emphasize the Visit OpenStreetMap link.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Alter or remove "Visit OpenStreetMap" button on Account page in settings #144

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[stopflock]

Ah, I did this - one of the last few commits to main. All I did was move the "about osm" bubble to the about/info page, leaving only the functional bits on the account page.
I think what you did here would have been better, but not by so much that it's worth backing out and switching at this point. Oops.