Convert ReadingGoalProgress partial to Jinja

[RayBB]

This is a good first issue. Comment that you'd like to work on it — don't wait to be assigned — then open a PR referencing this issue. Anyone may open a PR, but please don't open one if another PR is already open for this issue.

Part of #13566. See the epic for the full pattern, playbook, and test steps.

Convert 3 files: openlibrary/templates/reading_goals/reading_goal_progress.html (29 lines), openlibrary/templates/reading_goals/reading_goal_form.html (24 lines), openlibrary/templates/native_dialog.html (15 lines). Render from ReadingGoalProgressPartial in openlibrary/plugins/openlibrary/partials.py. Delete the old files. Switch the 2 account/view.html call sites of the form and dialog in the same PR (or bridge them — state your choice in the PR).

Test GET /partials/ReadingGoalProgress.json while logged in (dev user openlibrary / openlibrary). Keep the parsed DOM identical. No new tests.

[Nehant14]

I’d like to work on this issue. I’ll open a PR once it’s done.