hand recorder: login command works from Frametop's Konsole

Frametop's Konsole sets XDG_RUNTIME_DIR=/run/user/UID/frametop, where podman finds
no container state, so 'distrobox enter dev -- hf auth login' failed with a crun
error. The command the Upload page shows now sets the real runtime folder.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

hands/rec/DESIGN.md

@@ -340,7 +340,7 @@ On 2026-10-02 a whole session showed "I can't see your hands": after the headset
     8. Mark the record `"status": "done"` with `uploaded`. `export_sha` is the SHA256 of `SHA256SUMS`. The file keeps its modification time, so the export doesn't count as out of date. Only finished records count as "uploaded before" (records without a status are from before 2026-10-03 and finished).
 
     Errors get a plain explanation: not logged in, a token Hugging Face rejects (401), a token that can't open a pull request (403), terms not accepted, dataset not found, network errors. `--dry-run` does everything except the network calls and the record, and lists what it would upload.
-  - **The page** shows the login (`whoami`, with "Check again"). If nobody is logged in, it explains how to run `distrobox enter dev -- hf auth login` in Konsole with a write token: the token goes only into that terminal. The page then has Upload and Cancel, the phase with a progress bar (a share while the export is checked, a sweep while it's sent, as `huggingface_hub` reports no progress), the pull request's link once it's open, with "plug in the headset and leave it plugged in until this says Uploaded", and Uploaded at the end. If this export was uploaded before, the page says so, and uploading it again asks first. A stale export can't be uploaded.
+  - **The page** shows the login (`whoami`, with "Check again"). If nobody is logged in, it explains how to run `XDG_RUNTIME_DIR=/run/user/$(id -u) distrobox enter dev -- hf auth login` in Konsole (Frametop's Konsole has its own runtime folder, where podman can't find the container) with a write token: the token goes only into that terminal. The page then has Upload and Cancel, the phase with a progress bar (a share while the export is checked, a sweep while it's sent, as `huggingface_hub` reports no progress), the pull request's link once it's open, with "plug in the headset and leave it plugged in until this says Uploaded", and Uploaded at the end. If this export was uploaded before, the page says so, and uploading it again asks first. A stale export can't be uploaded.
   - **Staying awake:** while an export or an upload runs, the window holds a host unit, `frametop-handrec-awake.service`, running `systemd-inhibit --what=sleep:idle --mode=block ... sleep infinity`, and stops it when the last of them ends (or on quit). It's meant to keep Steam from putting the Frame to sleep with the headset off; whether Steam's sleep honours a logind block inhibitor is still to be checked on the device. Exports and uploads are done in the headset: the export page only notes that VR may stutter a little while it compresses.
   - **While the texts are drafts**, Upload stays off unless `FT_HANDREC_ALLOW_UPLOAD=1`, so the maintainer can rehearse against a private test repo. `FT_HANDREC_DATASET` overrides `HF_DATASET`. `ft-handrec --hub-dry-run` makes Upload a dry run: no network, so it isn't held back by the drafts.
   - **Rehearsal: `hands/rec/rehearse.sh [--repo ID]`** runs it all without the headset, in the dev container, in one `frame-job --local` scope when frame-job is installed. `ft-ringplay` plays 30 s of a recording into a ring in `/run/user/UID`. A tracking ft-hands that's already running is used, or one is started on that ring. `ft-handpanel --no-vr` stands in for the panel. `session.py --no-start --next-after 0.3` records a three-section test script (a prompt, a two-cue sweep, no hands) in step mode, three parts of 6 s (countdown and hold), about 360 MB once exported. Then `takes.py` exports, `validate.py` checks, and `hub.py` uploads: a dry run by default, or for real to `--repo ID` with `FT_HANDREC_ALLOW_UPLOAD=1`. It prints a summary, deletes its temporary folders (camera images of a room) and stops everything it started, Ctrl+C included. The `--no-vr` panel logs no poses, so `poses.jsonl` is missing there (a warning).