chore(MC-4488): Add landing popup

[sidharthv96]

📑 Summary

Adds a popup when user lands on docs site.

📏 Design Decisions

Describe the way your implementation works or what design decisions you made if applicable.

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🦋 If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9f77459

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codecov]

Codecov Report

❌ Patch coverage is 0.51020% with 195 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.33%. Comparing base (547e6d5) to head (9f77459).
⚠️ Report is 459 commits behind head on master.

Files with missing lines	Patch %	Lines
.../docs/.vitepress/components/LandingIntentModal.vue	0.00%	151 Missing ⚠️
...ckages/mermaid/src/docs/.vitepress/landingPopUp.ts	0.00%	42 Missing ⚠️
...ackages/mermaid/src/docs/.vitepress/theme/index.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #7654      +/-   ##
=========================================
- Coverage    3.59%   3.33%   -0.26%     
=========================================
  Files         475     528      +53     
  Lines       47191   55515    +8324     
  Branches      735     798      +63     
=========================================
+ Hits         1696    1851     +155     
- Misses      45495   53664    +8169     

Flag	Coverage Δ
unit	3.33% <0.51%> (-0.26%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...es/mermaid/src/docs/.vitepress/unplugin-icons.d.ts	100.00% <100.00%> (ø)
...ackages/mermaid/src/docs/.vitepress/theme/index.ts	2.04% <0.00%> (-0.35%)	⬇️
...ckages/mermaid/src/docs/.vitepress/landingPopUp.ts	0.00% <0.00%> (ø)
.../docs/.vitepress/components/LandingIntentModal.vue	0.00% <0.00%> (ø)

... and 111 files with indirect coverage changes

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	6 changed	Apr 23, 2026, 11:27 AM