docs: use absolute paths for internal links in plan-mode.md

[jerop]

Convert relative internal links to absolute paths starting with /docs/ and including .md extension to fix Astro link validation errors.

Related to #16871

[gemini-code-assist]

Summary of Changes

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This pull request focuses on enhancing the reliability and consistency of the documentation by updating internal links in the plan-mode.md file. The change ensures that all internal references adhere to an absolute path format, which resolves existing link validation issues and improves the overall integrity of the documentation site.

Highlights

• Documentation Link Fixes: Converted all relative internal links within plan-mode.md to absolute paths, starting with /docs/ and including the .md extension.
• Astro Link Validation: Addressed and resolved Astro link validation errors by standardizing the internal link format.

Changelog

• docs/cli/plan-mode.md
  • Converted relative internal links to absolute paths (e.g., ../tools/file-system.md to /docs/tools/file-system.md).

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[gemini-code-assist]

Code Review

This pull request updates internal links in docs/cli/plan-mode.md to use absolute paths, which is a good improvement for documentation consistency and fixes link validation errors. I've reviewed the changes and found a couple of instances where the link anchors still appear to be incorrect, which would lead to broken navigation. I've left specific comments with suggestions to correct these anchors to ensure all links function as intended.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[github-actions]

Size Change: -385 B (0%)

Total Size: 26 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	25.5 MB	-385 B (0%)
./bundle/node_modules/@google/gemini-cli-devtools/dist/client/main.js	221 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/_client-assets.js	227 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/index.js	11.5 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/types.js	132 B	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B
./bundle/sandbox-macos-strict-open.sb	4.82 kB	0 B
./bundle/sandbox-macos-strict-proxied.sb	5.02 kB	0 B

_{compressed-size-action}

[chrstnb]

Build failed: Build process failed with link errors:

19:28:01 [ERROR] ✗ Found 5 invalid links in 4 files.
19:28:01   ├─ /docs/extensions/index.md - invalid link
19:28:01   └─ /docs/extensions/index.md - invalid link
19:28:01   └─ /plans/ - invalid link to custom page
19:28:01   └─ /plans/ - invalid link to custom page
19:28:01   └─ /plans/ - invalid link to custom page
19:28:01 [ERROR] [starlight-links-validator-integration] An unhandled error occurred while running the "astro:build:done" hook
    Some invalid links point to custom pages which cannot be validated, see the `exclude` option for more informations at https://starlight-links-validator.vercel.app/configuration#exclude