fix: prevent bypass confirmation dialog jump

[snowykr]

What this changes

• Disables the shared transform-and-scale entrance animation for the one-time Bypass permission confirmation dialog.
• Adds a DOM regression assertion that the dialog uses the static entrance class.

Why

Selecting Bypass could render the confirmation dialog briefly off its final centered position before it snapped into place. The common dialog animation overrides the transform used for centering. This change keeps the safety confirmation at its final center position from its first rendered frame.

Reproduction

1. Open a project that has not previously acknowledged Bypass mode.
2. Open the permission-mode picker and select Bypass.
3. Observe the Turn off permission prompts? confirmation dialog.

Expected: the dialog appears at its final centered position.

Actual before this change: the dialog could begin offset and visibly snap into the center during its entrance animation.

Scope and impact

• User-visible behavior: only the Bypass confirmation dialog no longer animates its position or scale on open.
• Permission selection, acknowledgement, cancellation, and mode persistence are unchanged.
• No API, migration, compatibility, security, or platform-specific behavior changes.
• No runtime failure path changes; dismissing or confirming the dialog retains its existing behavior.

Related work

No related issues or pull requests found after searching the upstream repository for bypass dialog.

Verification

• dist-native/bun test src/components/chat/view/PermissionModePicker.dom.bun.test.tsx — 5 passed.
• npm run lint — passed.
• npm run build — passed.
• Manual reproduction in the local macOS development app confirmed the original snap when the shared animation was restored.
• npm run verify reached and passed audit, license, notices, typecheck, and Rust-core checks, but the repository-wide Node test run currently fails in nine unrelated client suites because react-syntax-highlighter@16.1.1 does not export oneDark from react-syntax-highlighter/dist/esm/styles/prism. This branch does not touch the syntax-highlighter import or its dependency version.

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[devswha]

Verified the mechanism: @keyframes dialog-content-show animates transform from translate(-50%, -48%) scale(0.96), which replaces the centering translate for the 150 ms entrance — a real snap, and a moving frame is especially wrong on a destructive-action confirmation. animate-none through cn() correctly overrides animate-dialog-content-show (tailwind-merge conflict group / emit order both land on animate-none), scoped to this dialog only. Dom test 5/5 green on current main. LGTM.