[Feat] Shareable testimonials

[frimpongopoku]

Summary / Highlights

• [X] New view for testimonial list page
• [X] New testimonial full view page
• [X] New addition to testimonial form

DEMO

https://github.com/user-attachments/assets/21861f37-3c67-4230-80c6-c70f5dee7746

Details (Give details about what this PR accomplishes, include any screenshots etc.)

Testing Steps (Provide details on how your changes can be tested)

Requirements

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've tested my changes manually.
• [ ] I've added unit tests to my PR.

Transparency (Project board)

• [x] I've given my PR a meaningful title.
• [ ] I linked this PR to the relevant issue.
• [ ] I moved the linked issue from the "Sprint backlog" to "In progress" when I started this.
• [ ] I moved the linked issue to "QA Verification" now that it is ready to merge.

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [x] Feature
• [ ] Performance improvement
• [ ] Feature removal
• [ ] Code style update
• [ ] Refactor
• [ ] Docs
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• [x] It's submitted to the dev branch or to a feature branch, not the main branch
• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• [ ] All tests are passing:
• [ ] New/updated tests are included

Other information: Any otherthing we need to know