Merge branch 'dev' into markdalgleish/routes-mode

Author: markdalgleish

.changeset/angry-students-pay.md

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+---
+"@react-router/dev": minor
+"react-router": minor
+---
+
+Added a new `react-router.config.ts` `routeDiscovery` option to configure Lazy Route Discovery behavior.
+
+- By default, Lazy Route Discovery is enabled and makes manifest requests to the `/__manifest` path:
+  - `routeDiscovery: { mode: "lazy", manifestPath: "/__manifest" }`
+- You can modify the manifest path used:
+  - `routeDiscovery: { mode: "lazy", manifestPath: "/custom-manifest" }`
+- Or you can disable this feature entirely and include all routes in the manifest on initial document load:
+  - `routeDiscovery: { mode: "initial" }`

.changeset/bright-experts-grab.md

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+---
+"@react-router/dev": patch
+---
+
+Support project root directories without a `package.json` if it exists in a parent directory

.changeset/cold-seals-count.md

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+---
+"@react-router/dev": patch
+---
+
+When providing a custom Vite config path via the CLI `--config`/`-c` flag, default the project root directory to the directory containing the Vite config when not explicitly provided

.changeset/forty-ants-teach.md

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+---
+"@react-router/dev": patch
+---
+
+Ensure consistent project root directory resolution logic in CLI commands

.changeset/pink-candles-allow.md

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+---
+"react-router": patch
+---
+
+Fix `handleError` `params` values on `.data` requests for routes with a dynamic param as the last URL segment

.changeset/silly-ligers-dress.md

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+---
+"react-router": patch
+---
+
+Don't trigger an `ErrorBoundary` UI before the reload when we detect a manifest verison mismatch in Lazy Route Discovery