umputun / revdiff / 30955741760

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fix(ui): mark truncated help rows and sync the mouse docs

four doc surfaces still said the help overlay ignores mouse events, which the
scroll support made false. Horizontal truncation cut rows with no marker while
every other truncation in the codebase carries one, and the overlay has no
horizontal scroll to recover the text.

also replaces the height assertion in TestModel_HelpOverlayNeverExceedsTerminal,
which could not fail: overlayCenter drops popup rows outside the background, so
the composed view is always exactly the terminal height. Clipping shows up as
missing content, so the test now checks the popup's first and last rows survive.

Related to #304

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