Contract: one list of issues and one of pulls. The studio's lists serve every repository #627

Pillar: P1 Feed (umbrella #587). Contract: one of the duplicated screens the studio/dev split left behind. One run, fresh from today's main.

The job: see a repository's open issues or pulls and pick one.

Survivor: the studio lists in src/web/studio/lists.ts (tells and changes), with dev's filters that earn their place (state, assignee, label).

Removed in this same pull: dev's issue and pull lists in src/web/pages/issues.ts and src/web/pages/pulls.ts, and the "See dev's list" links.

The path: a person from a repository page wants the backlog or what is in review; primary action open a row; next that issue or change.

Acceptance.

• [ ] One renderer for this job, for every repository and every viewer; the other code and its tests are deleted, not hidden.
• [ ] Every old URL still answers (the survivor, or a redirect); ?mode=dev on it shows the survivor.
• [ ] Nothing the removed screen did is lost: the pull lists each thing it showed or did and where it lives now (or why nobody needs it).
• [ ] Minimal, not bare: one primary next action, white space at every width, nothing the person does not need now.
• [ ] Looks of the path at phone and desktop widths on the pull; the full check green.

Start from: src/web/studio/lists.ts, src/web/pages/issues.ts, src/web/pages/pulls.ts.

Must not touch: the release workflow, the chart, other repositories.