fullscreen: remember last tab when unhiding tabs in fullscreen mode

[skueee]

Moved the active_tab variable from tabs.rs to desktop.rs so that its state is preserved when toggling the tabs panel.

AI Disclosure

I used Gemini 3.6 Flash (Web) to get a bit of help with git and to check if my English was correct as it is not my native language. I reviewed every change and command that the AI generated.

Sanity Checking

• I have read and followed the contribution guidelines.
• My commits follow Kopuz's scoped commit convention and history hygiene
  rules.
• I have disclosed any AI assistance as required by the AI policy in the
  contribution guidelines, or this pull request did not use AI assistance.
• I have tested and self-reviewed my changes.

Style and Consistency

• My changes are consistent with the existing crate boundaries and Dioxus
  style.
• I ran cargo fmt --all --check or cargo fmt --all as appropriate.
• I ran cargo clippy --workspace --all-targets -- -D warnings, or
  explained why it could not be run.
• I kept generated assets, translations, and packaging files in sync when
  this change depends on them.

Testing

• I ran the smallest relevant verifier for this change.
• I documented any platform or verifier that I could not run.

Tested on platform(s):

• x86_64-linux
• aarch64-linux
• x86_64-darwin
• aarch64-darwin
• Windows
• Android
• iOS

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e80f3493-6ccd-4141-959b-ef728362a1b2

📥 Commits

Reviewing files that changed from the base of the PR and between 1d96fe0 and a0ba1d1.

📒 Files selected for processing (1)

• crates/components/src/fullscreen/tabs.rs

💤 Files with no reviewable changes (1)

• crates/components/src/fullscreen/tabs.rs

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📝 Walkthrough

Walkthrough

FullscreenDesktop now owns the active tab signal and passes it to Tabs. Tabs uses the shared signal for tab selection and content rendering.

Changes

Fullscreen tab state

Layer / File(s)	Summary
Lift active tab state into fullscreen desktop crates/components/src/fullscreen/desktop.rs, crates/components/src/fullscreen/tabs.rs	FullscreenDesktop initializes and passes the active tab signal. Tabs accepts the signal for tab selection and content rendering.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes preserving the last active tab when the fullscreen tabs panel is shown again.
Description check	✅ Passed	The description explains moving active_tab state to desktop.rs and documents testing and validation steps.
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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[skueee]

Current behavior :

2026-07-30.19-53-07.mp4

With the change :

2026-07-30.19-53-44.mp4

(forgot to upload that)

[temidaradev]

do cargo fmt --all