ClineProvider.getState() reports shared state instead of the view's own hydrated per-view selections #1549

Bug description

ClineProvider.getState() reads every state field directly from the shared ContextProxy (global extension state). Per-view selections held in the provider's view-local buffer (viewLocalState: mode, currentApiConfigName, apiConfiguration) are hydrated per webview from the durable viewStates map, but getState() never merges that buffer in — so every webview reports the same shared mode / API profile / provider configuration regardless of what that view actually selected.

Extension-side consumers of getState() therefore see the wrong mode / profile / apiConfiguration when multiple views hold different selections: a per-view mode or profile switch does not take effect for the view that made it, and provider settings reported for a view can belong to another view's selection.

Expected behavior

getState() should serve each per-view-capable field from the view's hydrated state when that view has a selection, falling back to the shared global value otherwise (view-local wins; fields the view has not selected are unchanged, with the existing defaults).

Proposed fix

In getState(), merge the view-local buffer on top of the context values before reading the state fields:

const stateValues = this.contextProxy.getValues()
const mergedStateValues = { ...stateValues, ...this.viewLocalState }

and read the per-view fields (including the apiConfiguration object, merged over the provider settings) from mergedStateValues. The write path already drops unknown modes and keeps the buffer consistent (validation on setValues / setValue), so the read path stays a pure merge with no new validation.

Reproduction

1. Create two ClineProvider instances over the same extension context (e.g. sidebar + editor webviews).
2. On each, save a per-view selection (mode, currentApiConfigName, or apiConfiguration) via the view-state save path.
3. Call getState() on both instances.
4. Both return the shared global values — the per-view selections are not reflected in the reported state.

Part of the vps2 durable per-view state series — tracked in easonLiangWorldedtech#41.