[timmyz]

Share ratio colouring and table row separators

Two small table display improvements, both enabled by default and toggleable from the layout menu.

Share ratio colouring

The share ratio column is now coloured according to its value:

ratio	colour	meaning
< 1	red	not made back yet
1 .. seedRatioLimit	orange	made back, not at the target yet
>= seedRatioLimit	green	target reached
< 0	uncoloured	unknown or infinite ratio

The upper bound is taken from the server side seedRatioLimit, the ratio at which the
daemon stops seeding. It defaults to 2 when the daemon does not report one. Using the
server value means the colouring matches the requirement of the tracker site without
any extra configuration, and it stays correct when the limit is changed in the session
settings.

Colours are taken from the Mantine palette and use light-dark(), so they follow the
active color scheme instead of being hardcoded.

Table row separators

An optional horizontal separator between the table rows. It makes wide tables easier
to follow across. The separator is drawn by the shared TrguiTable component, so it
applies to the torrents, files, peers and trackers tables.

Implementation notes

Table rows are memoized (MemoizedTableRow = memo(TableRow)), so a change of a value
stored in the config would not reach the cells that render it. The two options are
therefore carried in a small TableDisplayContext provided by the server component, and
the new value is written to the config before the state update, so the change is picked
up on the very same render.

Both options are added to the interface settings with a default of true, and are
toggled from the layout menu in the toolbar.

This is based on the request in jayzcoder#68.

Testing

Verified in the browser against a stub transmission RPC server with ratios covering all
three ranges plus the unknown/infinite case. The row separator was confirmed to render
at every row boundary and to disappear when the option is toggled off.

npm run webpack-prod builds cleanly and npx eslint src/ reports no problems.

[qu1ck]

There is a "Ratio progress" column (hidden by default) that shows ratio as a progress bar that fills up to seedRatioLimit and turns from blue to green. It already does what this change is doing, except for being red at < 1 ratio, which as a hardcoded value is not a good idea.

As for row separators they are not needed, tables already have striped even-odd background for that purpose.