project_panel: Add ability to hide hidden files

[smitbarmase]

Closes #5185

Release Notes

• Added an option to hide hidden files in the project panel by setting hide_hidden in the project panel settings.

[github-actions]

Squawk Report

✅ 0 violations across 1 file(s)

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crates/collab/migrations/20251008120000_add_is_hidden_to_worktree_entries.sql

ALTER TABLE "worktree_entries"
ADD "is_hidden" BOOL NOT NULL DEFAULT FALSE;

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No violations found.

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[zed-industries-bot]

	Warnings
⚠️	This PR is missing release notes. Please add a "Release Notes" section that describes the change: Release Notes: - Added/Fixed/Improved ... If your change is not user-facing, you can use "N/A" for the entry: Release Notes: - N/A

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