feat: add update methods to Pages resource

[Galeforce1]

Overview

Adds update_workspace_page and update_project_page to the Pages resource.

Motivation

The UpdatePage model already exists in plane/models/pages.py, but no
resource method uses it — Pages currently supports list, retrieve,
create, and delete, but not update. This closes that gap, following the
exact pattern already used by Cycles.update(), Projects.update(),
and other resources (self._patch(...) + data.model_dump(exclude_none=True)).

Changes

• Pages.update_workspace_page(workspace_slug, page_id, data)
• Pages.update_project_page(workspace_slug, project_id, page_id, data)

No new models, no breaking changes — purely additive.

Summary by CodeRabbit

• New Features
  • Added support for updating workspace pages.
  • Added support for updating project pages.
  • Page updates now return the refreshed page details.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 221b5b45-bf59-49a2-a0dc-84039a66d3c2

📥 Commits

Reviewing files that changed from the base of the PR and between a789ece and 52793a7.

📒 Files selected for processing (1)

• plane/api/pages.py

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📝 Walkthrough

Walkthrough

The Pages resource now exposes workspace- and project-scoped page update endpoints. Both methods serialize UpdatePage data, issue PATCH requests, and return validated Page models.

Changes

Pages API updates

Layer / File(s)	Summary
Page update methods plane/api/pages.py	Imports UpdatePage and adds workspace- and project-scoped PATCH methods that exclude unset fields and validate responses as Page models.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change by adding update methods to the Pages resource.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Galeforce1]

Heads up — this is a dependency for makeplane/plane-mcp-server#190, which needs update_workspace_page()/update_project_page() to implement its update_page MCP tool. Would appreciate a look here so that PR can move forward.