fix(web-pkg): keep full folder names when file extensions are hidden

[AlexAndBear]

Description

This bugfix ensures that the "Show file extensions" preference only affects files and never truncates folder names.

Why this is important:

• Folder names are often semantic identifiers, not cosmetic labels.
• Hiding a folder suffix changes the visible identity of the folder and can make users open, move, or share the wrong target.
• In date/version naming conventions, the segment after the last dot is usually meaningful data.

Examples where full folder names must stay visible:

• 20.01.2026
• 2026.01.Release
• Q4.2026.Archive
• Project.Alpha.v2
• Customer.ACME.2026
• Invoices.2026.01

Technical changes:

• Apply extension split/render logic only for resources with type === 'file' in ResourceName.vue.
• Keep folder names with dot segments fully visible in table/list/tile rendering.
• Prevent trailing-dot titles for files without an extension (for example README, not README.).
• Add targeted unit tests for both behaviors in ResourceName.spec.ts.

Related Issue

• Fixes <issue_link>

How Has This Been Tested?

• test environment: local development workspace on macOS, pnpm + Vitest
• test case 1: pnpm test:unit --run packages/web-pkg/tests/unit/components/FilesList/ResourceName.spec.ts
• test case 2: pnpm test:unit --run packages/web-pkg/tests/unit/components/FilesList/ResourceTable.spec.ts

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[AlexAndBear]

@JammingBen @kulmann IHMO this is 'cirticial' and shouldn't be implemented that way, in the first place 🤷‍♀️

[Copilot]

🟢 Approval recommended

No unresolved blocking issues were identified.

Pull request overview

Fixes resource-name rendering so extension hiding applies only to files, preserving dotted folder names and avoiding trailing dots for extensionless files.

Changes:

• Restricts extension logic to file resources.
• Preserves full dotted folder names.
• Adds targeted unit tests.

File summaries

File	Summary
packages/web-pkg/tests/unit/components/FilesList/ResourceName.spec.ts	Adds regression tests for dotted folders and extensionless files.
packages/web-pkg/src/components/FilesList/ResourceName.vue	Restricts extension rendering to files.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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