terminal: reset style before VT replay of blank cells (on 9d8d40319)

[lawrencecchen]

Same two commits as #246, on 9d8d40319 (9961d09be plus its test expectation fix). #248 used 9961d09be directly, whose own Page VT preserves a fully styled blank row test is red and blocks GhosttyKit publication. e1b8bf5f4 is excluded on purpose: on current cmux main it stops cmux DEV.app from opening its socket in FuzzRegressions.

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Summary by cubic

Fixes VT replay of blank cells so they no longer inherit the previous cell's background color.

• Resets the active style before writing accumulated blank cells as spaces.
• Adds a regression test covering Black background followed by skipped cells via CHA.

^{Written for commit 5597402. Summary will update on new commits.}

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• src/terminal/formatter.zig

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