Plugin: add a persistent thread status control card

[huntharo]

Problem

When a thread is resumed, or when /codex_status is run, we should show a richer pinned status/control surface instead of only plain text.

This needs to behave like a durable thread control card, not a one-shot reply.

Current Findings

• The plugin already has most of the raw primitives:
  • /codex_status
  • /codex_fast
  • /codex_model
  • /codex_permissions
  • /codex_compact
  • /codex_rename
• Resume/bound summary messages are already pinned in Telegram/Discord.
• Current status output already includes model, service tier, approval policy, sandbox, project/worktree folder, and context usage.
• The plugin already knows how to rename supported Discord channels / Telegram topics.
• Stored binding state only persists one pinned message reference plus context usage. It does not currently persist thread-level fast/model/permission preferences in local plugin state.
• Current callbacks support set-model and rename-thread, but there are no status-card callbacks yet for toggling fast mode, permissions, compact, or sync-name.
• Upstream App Server thread status supports active flags for waitingOnApproval and waitingOnUserInput, which are useful for a status card.

Proposed Scope

• Keep one pinned "thread controls" message per bound conversation when possible.
• Add buttons for:
  • sync thread/topic name
  • fast on/off
  • permissions mode toggle
  • compact
  • maybe model selection
  • maybe dismiss buttons
• On /codex_status, /codex_model, /codex_fast, /codex_permissions, and /codex_compact, refresh the pinned card if it still exists.
• Treat stale button messages as acceptable; callbacks should re-read current thread state instead of assuming local state is still accurate.
• Include current context usage on the compact control if available.

Source Notes

• Command registration list: index.ts:5
• Fast command: src/controller.ts:1376
• Model command: src/controller.ts:1406
• Permissions command: src/controller.ts:1463
• Rename command: src/controller.ts:1510
• Bound summary pinning: src/controller.ts:3192
• Status text builder: src/controller.ts:3213
• Stored binding schema: src/types.ts:250
• Callback action union: src/types.ts:290
• Status formatting: src/format.ts:194
• App Server thread status shape: codex-rs/app-server-protocol/schema/typescript/v2/ThreadStatus.ts:6
• App Server active flags: codex-rs/app-server-protocol/schema/typescript/v2/ThreadActiveFlag.ts:5
• Upstream /status and /fast are client-side concepts: /Users/huntharo/github/codex/status-fast-app-server-notes.md:5