Add more QoL and high prio features

TODO.md

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+# TODO
+
+The read-only model now includes paginated review threads and comments, PR
+conversation comments, submitted reviews, individual checks, branch-protection
+requirements, rulesets, merge queues, deployment requirements, viewer
+capabilities, head SHA, persistent unread updates, offline cache fallback,
+commit/force-push history, and paginated checks and annotations.
+The following read-only improvements remain before or alongside write support.
+
+## Workflow and navigation
+
+- Open the current PR, comment, review, check, or source location in a browser.
+- Copy URLs, commit SHAs, file paths, and rendered comment text to the
+  clipboard.
+- Add navigation for the next thread by status or author, not only the next
+  unread update.
+- Remember the selected PR, thread, scroll position, pane width, and folded
+  state between runs.
+- Audit screen-reader behavior beyond the new no-color and high-contrast modes.
+
+## Data completeness and resilience
+
+- Model pending reviews, minimized comments, deleted comments, and explicit
+  reply relationships.
+- Show rate-limit remaining/reset information and distinguish it from network
+  or permission failures.
+- Support retrying individual failed pages while retaining clearly marked
+  partial data, rather than failing the entire refresh.
+- Add fixture coverage for GitHub Enterprise Server schema differences, team
+  reviewers, deleted users, very large PRs, and mixed legacy status contexts.
+
+## Preparation for write support
+
+- Fetch per-comment update/delete permissions and the exact reply target IDs.
+- Define head-SHA conflict handling for comments and suggestions composed
+  against an older revision.
+- Design confirmation and optimistic-update behavior for resolving threads,
+  submitting reviews, and applying suggestions.