Visor: improve identity glyph visibility and selection contrast

[lannbot]

Summary

• Enlarge the identity circle to 32px with a 20px, weight-600 glyph and unit line height.
• Use the medium-dark strip-edge shade as its background, with light text; emoji retain their native artwork.
• Reserve the light selected-half fill for the app side. Settings selection uses a subtle bottom indicator without changing the identity circle.
• Fix CI-discovered drawer timing: wait for launch dismissal in the test helper, exclude closing panes from settled state, and use a 1ms reduced-motion animation so completion events arrive reliably.

Verification

• Astra review complete; real-app desktop and mobile screenshots inspected with letters and single-codepoint emoji.
• just check, just test, and just e2e passed (29 browser scenarios).
• Extend the existing contrast sweep with a saved letter glyph, check geometry and selection styles, and verify the circle is unchanged across selection transitions.
• Reduced-motion navigation passed 12 consecutive runs at 8x CPU throttle; mobile layout, contrast, and narrow-layout scenarios each passed 10 consecutive runs.

Dark emoji can still have low contrast against the dark background; no halo or alteration of emoji artwork was added. Physical Android was not tested.

Automerge will be armed.