Feedback: my bubbles were too dark, and avatars showed only a person
glyph, never the profile name. Now both bubbles are light with dark text
(mine a tonal green, the peer's white with a hairline) — the side and the
per-person avatar colour carry the "who", so nothing is heavy to read.
Load my own display name from ProfileStore so my avatar shows my initial
too, not just the peer's; each avatar still falls back to a glyph when no
name is known.
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