fix: desktop defaults to bookmarklet login tab; conversation messages newest-at-bottom

[Copilot]

Two UX fixes for messages.html based on review feedback.

Changes

• Login tab auto-selection: Detect desktop vs. mobile via (hover: hover) and (pointer: fine) media query. Desktop opens the bookmarklet tab by default; mobile/touch opens session login by default.

var isDesktop = window.matchMedia('(hover: hover) and (pointer: fine)').matches;
var defaultTab = isDesktop ? 'bookmarklet' : 'manual';

• Conversation message order: API response is reversed before rendering so oldest messages appear at the top and newest at the bottom, matching standard chat UX.

tbody.innerHTML = mails.slice().reverse().map(function(m) { … }).join('');

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Summary by cubic

Adds messages.html WebUI for short messages. Addresses Linear 752 by prioritizing login options by device and showing newest messages at the bottom.

• New Features
  • New messages.html page for short-message viewing.
  • Device-aware login: desktop shows bookmarklet login first; mobile shows session login first.
  • Newest messages appear at the bottom.

^{Written for commit cf095af. Summary will update on new commits.}

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