🤖 fix: web interface guideline compliance

[ibetitsmike]

Summary

• Restore keyboard focus indicators by limiting global outline suppression to :focus:not(:focus-visible).
• Add missing aria-labels for icon-only buttons and label otherwise-unlabeled inputs.
• Improve keyboard activation semantics for review hunks (Enter/Space) and set aria-expanded.
• Stop blocking paste in chat input; still extract pasted images as attachments.
• Replace transition-all with targeted transitions and replace ... with … in user-facing strings.
• Add stable sizing for some image thumbnails to reduce layout shift.

Validation

• make static-check

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