Fix file picker truncating paths within available width

[bradleyjames]

The file picker capped combined filename + path length at 55 characters, leaving significant horizontal space unused in wider popovers. Drops that cap for the command palette file picker and switches the path text to render a leading … (instead of a fade) when overflow does happen.

Also fixes a latent paint bug in Start + Ellipsis text clipping: the ellipsis-reservation shifted glyphs leftward without compensating their origin, so the leftmost visible glyph overlapped the ellipsis at the same x. Adds regression-protection unit tests for the start-clipping paint path.

Fixes #8709

Description

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[cla-bot]

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@bradleyjames

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[oz-for-oss]

Overview

This PR removes the command palette file picker's fixed combined name/path cap, changes overflowed path text to leading ellipsis clipping, and adjusts start-ellipsis glyph painting in WarpUI.

Concerns

• The new unit test documents that the test FontDB gives the ellipsis a zero-width advance, so it does not exercise the newly added nonzero ellipsis offset path.

Verdict

Found: 0 critical, 0 important, 1 suggestions

Approve with nits

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[oz-for-oss]

💡 [SUGGESTION] Because the test FontDB makes ellipsis_width zero, this regression test never executes the new start_ellipsis_offset = ellipsis_width path; use a nonzero ellipsis advance or a smaller unit seam so it fails without the production fix.

[vorporeal]

looks way better. thanks for the fix!

[vorporeal]

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[bradleyjames]

@vorporeal , done

[vorporeal]

@cla-bot check

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