docs(channels): update troubleshooting.md — ID-based channel ACL + silent-drop migration symptom (post-netclaw-dev/netclaw#1368)

[Aaronontheweb]

Context

Update src/content/docs/channels/troubleshooting.md after netclaw-dev/netclaw#1368 ships.

Current

• "Run netclaw init" as the fix for token/channel configuration issues
• Fix examples reference raw DefaultChannelName / DefaultChannelId fields
• No mention of the display-name → canonical-ID migration introduced in #1368

Should become

• Replace "run netclaw init" token-fix instructions with "run netclaw config → Channels"
• New symptom section: "Channel messages silently dropped after upgrading from pre-0.24.0"
  • Cause: AllowedChannelIds held display names (e.g. #general) that no longer match canonical IDs after the upgrade — the ACL check fails silently
  • Fix: Re-enter the channel list via netclaw config → Channels (resolve-before-add stores canonical IDs automatically)
  • Manual JSON fix (for advanced users): replace display names with canonical IDs; add a "config does this automatically" note
• Retain existing diagnostic steps for other symptoms; update any netclaw init re-run instructions to use the new action menu (Redo Identity / Open config editor / Start over / Cancel)

Screenshots or tapes needed

None required — prose/copy update. Optionally include config-channels-resolve from sub-issue #13 if helpful.

Acceptance criteria

• "Run netclaw init" token-fix replaced with netclaw config
• New "silent drop after upgrade" symptom documented with cause + fix
• Manual JSON fix retained with "config does this automatically" note
• Any remaining netclaw init re-run references updated to action menu

Dependencies

• Can start now — no binary required for copy changes
• Sub-issue docs(cli): new page cli/config.md — netclaw config dashboard reference (post-netclaw-dev/netclaw#1368) #59 (cli/config.md) for cross-link
• Stable release tag containing feat(init,config): simplified init, rebuilt config TUI, canonical channel-ID resolution netclaw#1368 for final accuracy check

Part of #55