Show reviews on your own profile and rework the seller header

[AndrewG828]

Stacked PR 14 of 15. Based on #123 — merge in order.
#111 → #112 → #113 → #114 → #115 → #116 → #117 → #118 → #119 → #120 → #121 → #122 → #123 → #124 → #125

Your profile's third tab was Requests, which duplicated a list you can already
reach and had nothing to do with the other two. It becomes Reviews, backed by
the same getUserReviewsBySeller call the seller profile uses, so you can see
what buyers said about you without visiting your own page as a stranger.

Tabs now carry labels and counts rather than bare icons — three unlabelled
glyphs gave no clue what the third one was — and the count comes from the loaded
data, so an empty tab reads as "Archive (0)" instead of looking broken.

On the seller profile the header, tab bar and content become one scroll view
with the tab bar pinned, replacing three nested scroll views that each scrolled
independently. Follow moves up next to the rating where the decision is being
made, instead of a full-width bar below the metrics.

Two fixes:

• The toolbar showed the handle while the header (which already shows the name)
  was on screen, and literal placeholder copy — "For example, nothing" — once it
  scrolled away. Inverted: the toolbar names the profile only when the header
  carrying that name is gone.
• loadExternalUser refetched on every appear, including returning from a push.
  It now tracks the loaded and in-flight user ids and skips redundant loads,
  with forceRefresh for callers that mean it.

customToolbar is removed along with the header it drew.

Note for whoever picks up Requests: with the tab gone and Home no longer pushing
SearchView, there is no way left to reach NewRequestView. The feature isn't
deleted, just unreachable — it needs a home in the new navigation.

Co-Authored-By: Claude Opus 5 (1M context) noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_017R8mua9xepzF3mnRETtd6W

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