Closes #872
## Product slice
- gives delegated and unassigned Filed cards a distinct, addressable route
- authorizes detail reads by canonical issue author without granting assigned-only mutations
- renders filing receipts and Filed cards as mobile read-only sheets with body, ownership, labels, conversation, and Gitea handoff
- preserves browser Back to the Filed queue and keeps self-assigned filings on the normal editable route
- keeps the core runtime within the 99 KiB gzip budget by moving route code into the eagerly loaded workflow chunk
## Verification
- `pytest -q` — 1663 passed, 1 skipped
- pinned Playwright 1.55 release-artifact journey at 390×844 — 1 passed
- deterministic release bundle verification — passed
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Closes #872
Product slice
Verification
pytest -q— 1663 passed, 1 skipped