Match worksheet elements by local name when streaming

[dre3k]

Fixes #642.

Roo::Utils.each_element matched Nokogiri::XML::Reader#name — the qualified name — against the element names it was asked for. Worksheets serialized with an explicit namespace prefix (<x:row> rather than <row>, as emitted by the OpenXML SDK and ClosedXML) therefore matched nothing, so each_row_streaming yielded zero rows with no error while the non-streaming reader parsed the same file correctly:

s = Roo::Spreadsheet.open('prefixed_namespace.xlsx', extension: :xlsx)

s.last_row                                  # => 3
s.row(2)                                    # => [1, "Widget", 10]

n = 0
s.each_row_streaming { |row| n += 1 }
n                                           # => 0   <-- before this PR

SheetDoc#extract_dimensions missed for the same reason.

The change

Reader#name       → "x:worksheet", "x:sheetData", "x:row", "x:c", "x:v"
Reader#local_name → "worksheet",   "sheetData",   "row",   "c",   "v"

One line — compare local_name instead of name.

Nothing downstream needed changing. A matched node is re-parsed with Nokogiri::XML(node.outer_xml).root, and Nokogiri reports local names on that DOM, which is why cell_from_xml's case cell.name when 'is' / 'f' / 'v' was already prefix-agnostic.

Unprefixed documents are unaffected: local_name == name when there is no prefix. Reader#local_name is available across the entire nokogiri ~> 1 range the gemspec allows, so there is no compatibility caveat.

Tests

test/files/prefixed_namespace.xlsx is a new 3-row fixture whose workbook and worksheet parts are written with the x: prefix. Two examples are added under the existing #each_row_streaming describe block: one asserting every row is yielded, one asserting the streaming and non-streaming readers agree on row count.

Verified both directions:

• With the fix, the full suite is green — 177 runs / 2219 assertions / 0 failures (minitest) and 250 examples / 0 failures (rspec).
• Reverting only lib/roo/utils.rb fails the two new examples with got: [] and expected: 3, got: 0.

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