chore: upgrade Angular to v21.2.17

[Helias]

Upgrades Angular from v20.2.3 to v21.2.17 via ng update.

Changes

• All @angular/* packages, the CLI, and @angular-devkit/build-angular bumped to v21.
• TypeScript pulled to 5.9.3 as part of the update.
• src/main.ts: migration moved deprecated bootstrap options into providers.
• tsconfig.json: lib updated to a modern ES target.

Notes

• ng build passes (only pre-existing Sass @import deprecation warnings, unrelated to this upgrade).
• Stopped at v21 rather than the latest v22 because the v22 CLI requires Node v22.22.3+/24.15.0+/26.0.0+ and the current environment runs v22.22.2. The 21 to 22 hop can follow once Node is bumped.

🤖 Generated with Claude Code

Summary by CodeRabbit

Chores

• Updated Angular framework to version 21
• Updated TypeScript compiler to version 5.9.3
• Enhanced application initialization configuration

[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: 2d0e3f36-4a9c-4522-8500-5aa8be9eda98

📥 Commits

Reviewing files that changed from the base of the PR and between e9c3649 and f126086.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (3)

• package.json
• src/main.ts
• tsconfig.json

💤 Files with no reviewable changes (1)

• tsconfig.json

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📝 Walkthrough

Walkthrough

Upgrades Angular packages from v20 to v21 and TypeScript from 5.8.3 to 5.9.3 in package.json. Adds provideZoneChangeDetection() to the bootstrapApplication providers in src/main.ts. Updates tsconfig.json to remove the explicit lib array and set useDefineForClassFields to false.

Changes

Angular v21 Upgrade

Layer / File(s)	Summary
Angular and TypeScript version bumps package.json	Angular runtime packages (@angular/*) updated from 20.2.3 to 21.2.17 in dependencies; Angular CLI/build toolchain packages updated to 21.2.16/21.2.17 in devDependencies; typescript bumped from 5.8.3 to 5.9.3.
Bootstrap providers and tsconfig adjustments src/main.ts, tsconfig.json	provideZoneChangeDetection imported from @angular/core and added to bootstrapApplication providers alongside provideHttpClient(); tsconfig.json removes explicit lib array and adds useDefineForClassFields: false.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

Poem

🐇 Hop, hop, the version clock ticked,
From twenty to twenty-one we flicked!
Zone detection now wired in right,
TypeScript shines a little more bright.
The rabbit stamps the lockfile with glee—
Angular's newer, fast, and free! 🌟

🚥 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 PR title 'chore: upgrade Angular to v21.2.17' directly and clearly summarizes the main change—upgrading Angular dependencies to v21.2.17, which is supported by all the file modifications (package.json, src/main.ts, tsconfig.json).
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.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/upgrade-angular-21

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