LiveDuration returned a bare string with proportional digits, so the
statusbar reflowed every second as the timer ticked. Extract a shared
StableText component that renders each character in its own 1ch-wide
cell, preventing any digit from shifting the layout — works with the
proportional sans font, no need for font-mono.
Both LiveDuration (statusbar session/running timers) and
ActivityTimerText (tool activity timers) now use StableText, dropping
the font-mono + tabular-nums workaround from the latter.
Also renames statusbar.ts → statusbar.tsx since LiveDuration now
returns JSX.
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