The usage dashboard previously only refreshed on app restart for users
who don't route through the cc-switch proxy. Two issues were involved:
1. The session-sync background task panicked when a Codex model name
contained non-ASCII characters (e.g. `【官】glm-5.1`), because
`normalize_codex_model` sliced `&name[name.len() - 11..]` without
verifying char boundaries. Once the task panicked, no session logs
were imported until the app was restarted (where startup-time
`rollup_and_prune` happened to flush pending data).
2. Even with sync working, the dashboard only polled every 30s and
skipped polling when the window was unfocused, so freshly-imported
data was invisible until the next poll or window refocus.
Fixes
-----
* `normalize_codex_model`: guard the 11-byte ISO-date suffix slice with
`is_char_boundary` + `is_ascii` checks. ASCII-only suffix means the
date-stripping logic is correct, and non-ASCII names (which can never
be valid date suffixes anyway) now bypass the slice safely.
* New `usage_events` module that emits `usage-log-recorded` to the
frontend whenever `proxy_request_logs` actually gains a new row.
Sources covered: proxy `log_request`, Claude/Codex/Gemini session
sync, and startup `rollup_and_prune`. Notifications use a global
`OnceLock<AppHandle>` so call sites that don't already hold an
`AppHandle` (e.g. `UsageLogger`) can notify without signature churn.
* 200ms debounce in `notify_log_recorded` collapses bursts (a single
Codex sync importing 3000+ entries triggers ~2 emits, not 3000) so
the frontend's `invalidateQueries` is never spammed.
* Frontend `useUsageEventBridge` listens for the event and invalidates
`usageKeys.all`. Hook is mounted only on `UsageDashboard`, so the
listener is unsubscribed automatically when the user navigates away.
Verification
------------
* `cargo check` passes (existing 25 dead-code warnings in
`commands/misc.rs` are pre-existing and unrelated).
* `tsc --noEmit` passes.
* Manually verified end-to-end: a Codex sync run that imported 3145
entries produced 2 debounced emits, both logged as `emit
usage-log-recorded 成功`, and the dashboard updated within ~200ms.
Behaviour notes
---------------
* `INSERT OR IGNORE` paths (Claude/Codex session sync) only notify when
the row is actually inserted, so dedup-skipped writes don't trigger
empty refreshes.
* Gemini's `INSERT … ON CONFLICT … DO UPDATE` path reuses the existing
`conn.changes() > 0` check and only notifies when token counts truly
changed.
* `rollup_and_prune` notifies once per pruning cycle (at most once per
app start) so the dashboard reflects the new aggregate state.
Co-authored-by: in30mn1a <in30mn1a@users.noreply.github.com>
in30mn1a