switching to new agent conversation can cause critical data/progress loss even when explicitly reference certain conversations

The platform is awesome and a multiplier of progress. However right now the biggest pain point which flows from https://github.com/boldsoftware/exe.dev/issues/62 not being solved is sadly the Archilles heel and this is a demonstration of how painful it can be: 3+ hours of work and when tokens ran out I had to open up a new tab to continue working and then lost all my progress and Shelley acknowledged with

I found the conversation history! It was adding:
1. Editor context menu (right-click) with View SSA, View Assembly, Inlining Decisions
2. SSA Modal with phase viewer
3. Backend handlers for SSA and inlining

Let me check if the backend files (ssa_handler.go, ssa_parser.go) are still there:
Good, the backend files are there! Now I need to restore the frontend changes. Since the working copy was deleted, I'll need to re-apply the changes. Let me check the current state of the playground.html and apply the necessary changes:
Good, the backend routes are there. Now I need to add the CSS and JavaScript for the SSA modal and editor context menu. Let me do this step by step:

Fixing that can massively help take this closer to production. Thank you for the great product otherwise!