chore: upgrade Ionic 6 → 8 [closes #29]

[yi-hialong]

Summary

Upgrades Ionic 6 → 8 as required by issue #29.
This can only be merged after #28 (Angular 18→19) is merged.

Changes

• Upgrade @ionic/angular to ^8.0.0
• Upgrade @ionic/angular-toolkit to ^9.0.0
• CSS dark mode migration: replace @media (prefers-color-scheme: dark) with @import "@ionic/angular/css/palettes/dark.system.css"
• Review all ion-picker, ion-modal breakpoints, IonRouterOutlet animation changes

Depends On

• [UPGRADE] Angular 18 → 19 + standalone schematic + new control flow #28 (Angular 18→19, PR chore: upgrade Angular 18 → 19 + standalone schematic [closes #28] #79) must be merged first

Manual Test Checklist

• Login page
• Candidate list
• Candidate view/form
• Company view
• Any page using ion-modal
• Dark mode toggle

Closes #29.

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Related Knowledge

1 document with suggested updates is ready for review.

BAWES Universe

plugn-dashboard-ionic – Setup & API Config

View Suggested Changes

@@ -2,7 +2,7 @@
 
 ### Stack
 
-This project uses [Ionic Angular with Angular 14.x and Ionic Angular 6.1.9](https://github.com/BAWES-Universe/plugn-dashboard-ionic/blob/df58999aa0bc4780cf96becde4c3dc05da643a1a/package.json#L6-L55).
+This project uses [Ionic Angular with Angular 17.x and Ionic Angular 8.0.0](https://github.com/BAWES-Universe/plugn-dashboard-ionic/blob/df58999aa0bc4780cf96becde4c3dc05da643a1a/package.json#L6-L55).
 
 ### Install & Run Commands
 
@@ -75,7 +75,7 @@
 
 ### Stack
 
-This project uses [Ionic Angular with Angular 14.x and Ionic Angular 6.1.9](https://github.com/BAWES-Universe/plugn-ionic/blob/6766364857d8146d8b89356a015798e053357bbd/package.json#L6-L50).
+This project uses [Ionic Angular with Angular 17.x and Ionic Angular 8.0.0](https://github.com/BAWES-Universe/plugn-ionic/blob/6766364857d8146d8b89356a015798e053357bbd/package.json#L6-L50).
 
 ### Install & Run Commands
 

[Accept] [Edit] [Decline]

^{How did I do? Any feedback?}  

[yi-hialong]

Thanks for the suggestion! The doc version reference is now outdated — Angular 16 is the current target after #76. Will update the docs accordingly.