Turbo edits v2 (#1653)

Fixes #1222 #1646 

TODOs
- [x] description?
- [x] collect errors across all files for turbo edits
- [x] be forgiving around whitespaces
- [x] write e2e tests
- [x] do more manual testing across different models



<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds Turbo Edits v2 search-replace flow with settings/UI selector,
parser/renderer, dry-run validation + fallback, proposal integration,
and comprehensive tests; updates licensing.
> 
> - **Engine/Processing**:
> - Add `dyad-search-replace` end-to-end: parsing
(`getDyadSearchReplaceTags`), markdown rendering (`DyadSearchReplace`),
and application (`applySearchReplace`) with dry-run validation and
fallback to `dyad-write`.
> - Inject Turbo Edits v2 system prompt; toggle via
`isTurboEditsV2Enabled`; disable classic lazy edits when v2 is on.
> - Include search-replace edits in proposals and full-response
processing.
> - **Settings/UI**:
> - Introduce `proLazyEditsMode` (`off`|`v1`|`v2`) and helper selectors;
update `ProModeSelector` with Turbo Edits and Smart Context selectors
(`data-testid`s).
> - **LLM/token flow**:
> - Construct system prompt conditionally; update token counting and
chat stream to validate and repair search-replace responses.
> - **Tests**:
> - Add unit tests for search-replace processor; e2e tests for Turbo
Edits v2 and options; fixtures and snapshots.
> - **Licensing/Docs**:
> - Add `src/pro/LICENSE` (FSL 1.1 ALv2 future), update root `LICENSE`
and README license section.
> - **Tooling**:
> - Update `.prettierignore`; enhance test helpers (selectors, path
normalization, snapshot filtering).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7aefa02bfae2fe22a25c7d87f3c4c326f820f1e6. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

e2e-tests/turbo_edits_v2.spec.ts

@@ -0,0 +1,49 @@
+import { testSkipIfWindows } from "./helpers/test_helper";
+
+testSkipIfWindows("turbo edits v2 - search-replace dump", async ({ po }) => {
+  await po.setUpDyadPro();
+  const proModesDialog = await po.openProModesDialog({
+    location: "home-chat-input-container",
+  });
+  await proModesDialog.setTurboEditsMode("search-replace");
+  await proModesDialog.close();
+  await po.sendPrompt("[dump]");
+  await po.snapshotServerDump("request");
+  await po.snapshotServerDump("all-messages");
+});
+
+testSkipIfWindows("turbo edits v2 - search-replace approve", async ({ po }) => {
+  await po.setUpDyadPro();
+  const proModesDialog = await po.openProModesDialog({
+    location: "home-chat-input-container",
+  });
+  await proModesDialog.setTurboEditsMode("search-replace");
+  await proModesDialog.close();
+  await po.sendPrompt("tc=turbo-edits-v2");
+  await po.snapshotMessages();
+  await po.approveProposal();
+  await po.snapshotAppFiles({
+    name: "after-search-replace",
+    files: ["src/pages/Index.tsx"],
+  });
+});
+
+testSkipIfWindows(
+  "turbo edits v2 - search-replace fallback",
+  async ({ po }) => {
+    await po.setUpDyadPro();
+    const proModesDialog = await po.openProModesDialog({
+      location: "home-chat-input-container",
+    });
+    await proModesDialog.setTurboEditsMode("search-replace");
+    await proModesDialog.close();
+    await po.sendPrompt("tc=turbo-edits-v2-trigger-fallback");
+    await po.snapshotServerDump("request");
+    await po.snapshotMessages({ replaceDumpPath: true });
+    await po.approveProposal();
+    await po.snapshotAppFiles({
+      name: "after-search-replace-fallback",
+      files: ["src/pages/Index.tsx"],
+    });
+  },
+);