fix(studio): keep fix prompts readable and pointed at a live branch

[yordis]

• Fix prompts showed field annotations as raw byte arrays, so agents could not read the context they were meant to act on.
• A fix prompt copied from a URL whose branch was already merged or deleted pointed agents at a branch that no longer exists.

Closes #98
Closes #114

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PR Summary

Low Risk
Changes are limited to JSON decoding depth in the read-only bridge and client-side branch URL validation with baseline fallback; no auth or mutation paths.

Overview
Fix prompts and API JSON now show readable nested protobuf annotations instead of opaque byte blobs. The studio bridge recursively decodes google.protobuf.Any values inside already-decoded messages (with a depth cap), and exports decodeAnnotations with a regression test for annotations nested in an Any-wrapped schema.

Stale ?branch= URLs are handled in ModelShell: on load it lists branches once; if the URL branch is missing (merged/deleted), it clears the branch to baseline, shows an amber “no longer exists; showing baseline” banner (dismissible), and avoids targeting dead branches in copied prompts. Tests cover fallback, valid branch retention, and a single branch check across re-renders.

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📥 Commits

Reviewing files that changed from the base of the PR and between f97cd1a and ba050fb.

📒 Files selected for processing: 4

• tsworkspace/webapps/studio/server/decode-annotations.test.mjs
• tsworkspace/webapps/studio/server/index.mjs
• tsworkspace/webapps/studio/src/components/ModelShell.test.tsx
• tsworkspace/webapps/studio/src/components/ModelShell.tsx

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