Merge branch 'dev' into markdalgleish/handle-new-config-file

Author: pcattori

.changeset/afraid-games-rush.md

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+---
+"react-router": patch
+---
+
+Fix `react-router` module augmentation for `NodeNext`

.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/curvy-queens-hug.md

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+---
+"react-router": patch
+---
+
+Fix hydration error if a server `loader` returned `undefined`

.changeset/dirty-balloons-stare.md

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+---
+"@react-router/dev": patch
+---
+
+In a `routes.ts` context, ensure the `--mode` flag is respected for `import.meta.env.MODE`
+
+Previously, `import.meta.env.MODE` within a `routes.ts` context was always `"development"` for the `dev` and `typegen --watch` commands, but otherwise resolved to `"production"`. These defaults are still in place, but if a `--mode` flag is provided, this will now take precedence.

.changeset/dull-hotels-battle.md

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

.changeset/eleven-oranges-cheat.md

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+---
+"@react-router/dev": patch
+---
+
+When executing `react-router.config.ts` and `routes.ts` with `vite-node`, ensure that PostCSS config files are ignored