terminal: reset style before VT replay of blank cells (on 9961d09be)

[lawrencecchen]

The same two commits as #246, cherry-picked onto 9961d09be, the Ghostty commit cmux main pins today. cmux cannot pin 51c8da0ce yet: on current cmux main, e1b8bf5f4 (the OSC 133;A prompt change from #245) makes cmux DEV.app fail to open its socket in the FuzzRegressions UI test, with or without the formatter fix.

This PR puts e17043471 on fork main so the cmux submodule pin stays reachable. The content already exists on main through #246, so the merge only adds reachability.

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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 emitting accumulated blank cells, matching the row-break path.
• Adds a test covering a styled cell followed by skipped default cells.

^{Written for commit e170434. Summary will update on new commits.}

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• src/terminal/formatter.zig

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