Co-authored-by: Isaac

Treat pipeline search input literally when users type SQL LIKE wildcards, and add package-level override tests so nested SDK field access is exercised before runtime.

Previously, the TUI search callback overwrote req.Filter entirely with a
name LIKE expression, discarding any filter the user passed via --filter.
Now the name LIKE clause is combined with the existing filter using AND,
so both constraints apply together.

Several list override functions declared a named request parameter
(e.g. listReq) that was never used after flag binding. Replace these
with blank identifiers to satisfy go vet and make intent clearer.

The parameter is kept named in clusters, jobs, pipelines, and
workspace overrides where it is actively used for flag binding
or search closures.

Previously, RenderIterator and RunPaginated only returned the error from
tea.Program.Run(), ignoring any fetch error stored in the model. An API
error mid-stream would display an error screen in the TUI but the command
would still exit 0.

Now both functions inspect the final model via the new Err() accessor and
return the fetch error if set. Also documents the destructive MaxWidth
truncation behavior on ColumnDef and renderContent.

Fix four issues in the paginated TUI:

1. Entering search mode now sets loading=true to prevent maybeFetch from
   starting new fetches against the shared iterator while in search mode.
   In-flight fetches are discarded via the generation check.

2. executeSearch sets loading=true (was false) to prevent overlapping fetch
   commands when a quick scroll triggers maybeFetch before the first search
   fetch returns.

3. Pressing esc to close search now restores savedRows, savedIter, and
   savedExhaust (same as clearing the query via enter with empty input).

4. RenderIterator now checks the final model for application-level errors
   via the new FinalModel interface, since tea.Program.Run() only returns
   framework errors.

…ui-overrides

Remove the PaginatedModel type alias (FinalModel interface suffices).
Remove the duplicate TestPaginatedErrAccessor test that overlaps with
TestPaginatedModelErr. Reduce the 5-line MaxWidth truncation comment
to a single line.

Co-authored-by: Isaac