APPROVE.

Clean fix. Two issues rolled into one PR, both driven by wide content (the connector table) in flex panes:

• InlineDrawer.svelte: adding min-w-0 to both <Pane> wrappers is the right counter to overflow: visible re-enabling the flex default min-width: auto. The two new tests in InlineDrawer.svelte.spec.ts nail both failure modes — the main pane stretching past its container, and the drawer pane being squeezed to zero when the main content refuses to shrink. Using createRawSnippet with white-space: nowrap and a fat repeated string is a nice reproducible way to force min-content width without a fixture.
• TabPerformance.svelte: h-full on the scrollable column is what makes the background actually track the scroll (the container was collapsing to intrinsic content height, so the striped/gradient background didn't fill the scrolled region). Small but load-bearing.

The wrap-tightening of the WarningBanner string is unrelated to the fix; harmless.

Nits, all non-blocking:

• Commit subject has "bi-directinal" → "bi-directional" on the earlier PR, and here the body says "Testing: manual, added regression test" (singular) — you actually added two. Cosmetic.
• The second test asserts > 300 for a 40% of 1000px split. That's a wide tolerance (accepts 301..1000). If a future regression makes the drawer eat the whole width, this test would still pass. Consider toBeGreaterThan(350) and toBeLessThan(500) to bracket the expected split.