wire TUIFastRefreshInterval into dashboard model and update tests

Add fastRefreshMs parameter to NewModelWithConfig so callers can supply
the high-frequency tick cadence for stream and flame tabs. Convert the
streamTickCmd/flameTickCmd package-level functions to model methods that
honour fastRefreshEvery (falling back to the 200 ms constants when zero
for backward-compatibility). Add SetFastRefreshInterval setter so
RunWithTraceStarterConfig can apply cfg.TUIFastRefreshInterval after
construction. Update all 68 test call sites to pass fastRefreshMs=200
and add three new tests covering zero-fallback, stored value, and setter
behaviour.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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