fix(history): refresh session list when recording starts or stops

The Session History window only reloaded its session list on manual
Refresh, so starting or stopping a recording while it was open left
the active session showing the stale "Recording" state (or missing
end time/duration) until the user hit Refresh themselves.

ToggleRecording now triggers the same session-list reload the window
already does after pin/rename/delete, whenever the window is open.

Also fixed the "Recording" badge's bullet — the embedded font has no
glyph for U+25CF (●), so it was rendering as an empty box — with a
small painted dot instead.

Refs #175