Root cause: three interacting bugs caused the model picker to show the wrong
model or flicker after a profile switch.
Bug 1 — syncTopbar() fought switchToProfile().
After switchToProfile() set the picker to the profile's model, syncTopbar()
was called (via renderSessionList -> loadSession, then explicitly at the end)
and overwrote it with S.session.model -- the old session's model.
Fix: added S._pendingProfileModel flag. switchToProfile() sets it;
syncTopbar() checks it first, applies the override, then clears it.
S.session.model is also updated to the resolved value so subsequent
syncTopbar() calls are consistent.
Bug 2 — Raw option injected at top of list for mismatched model IDs.
Profile configs store model IDs like 'claude-sonnet-4-6' (hermes-agent
format: hyphens, no namespace prefix) but the dropdown has
'anthropic/claude-sonnet-4.6' (OpenRouter format: dots, with prefix).
The old code did sel.value = id, found no match, then injected a new
<option> at the top of the list -- creating a lowercase duplicate that
didn't match any real provider group entry.
Fix: _findModelInDropdown() normalises both sides (strip prefix, hyphens->dots,
lowercase) and finds the best matching existing option. No new options are ever
injected for profile switching.
Bug 3 — populateModelDropdown() injected raw option on cold load.
Same issue: if default_model from /api/models didn't exactly match a dropdown
value, an extra option was added. Fixed by using _applyModelToDropdown()
which only selects existing options.
New helpers in ui.js:
_findModelInDropdown(modelId, sel) -- smart fuzzy match, returns matched value
_applyModelToDropdown(modelId, sel) -- sets picker, returns resolved value
Tests: 426 passed, 0 failed.
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