feat: add date-based achievement filtering and lock visible button

[ImBIOS]

Summary

Add date-based achievement filtering and a "Lock Visible" button to enable bulk un-achieving of all achievements unlocked on a specific date.

Context

Currently, SAM has no way to filter achievements by their unlock date. Users who want to un-achieve all achievements unlocked on a specific date must manually scroll through the list, identify them by the "Unlock Time" column, and uncheck each one individually. This is tedious and error-prone, especially for games with many achievements.

Closes #603

Changes

New UI Controls (Achievement Toolbar)

• "Lock Visible" button (lock icon) — unchecks all currently visible achievements in one click
• "Date" label + "filter on" toggle + date picker — enables date-based filtering of achievements

Logic Changes

• Added date filtering in GetAchievements() that compares each achievement's unlockTime (Unix timestamp) against the selected date (converted to local date)
• Date filter works in combination with existing text filter and locked/unlocked display filters
• OnLockVisible handler unchecks all visible items
• OnDateFilterToggle enables/disables the date picker and refreshes the list
• OnDateFilterChanged refreshes the list when the date changes (only when filter is active)

Build Fixes

• Added GenerateResourceUsePreserializedResources property and System.Resources.Extensions NuGet package to both SAM.Game and SAM.Picker csproj files to fix building with .NET 8 SDK

Use Cases

1. Undo accidental batch unlock: Filter by the date achievements were incorrectly unlocked, then lock all visible and commit
2. Clean up specific day's progress: Select a date, see only that day's achievements, lock them all
3. Combined with existing filters: Use date filter + text filter + locked/unlocked filter together for precise control

Testing

1. Build the solution: dotnet build SAM.sln -c Debug
2. Run SAM and select a game with unlocked achievements
3. Click "filter on" next to "Date" in the toolbar
4. Select a date — only achievements unlocked on that date should appear
5. Click the "Lock Visible" button — all visible achievements should be unchecked
6. Click "Commit Changes" — changes should be stored

Files Changed

• SAM.Game/Manager.Designer.cs — New UI controls in toolbar
• SAM.Game/Manager.cs — Date filtering logic + event handlers
• SAM.Game/SAM.Game.csproj — Build fix for .NET 8 SDK
• SAM.Picker/SAM.Picker.csproj — Build fix for .NET 8 SDK

[Copilot]

Pull request overview

Adds achievement-list tooling in SAM’s game manager UI to support filtering achievements by unlock date and quickly locking all currently displayed achievements, plus build changes aimed at .NET 8 SDK compatibility for net48 WinForms projects.

Changes:

• Adds a “Lock Visible” toolbar button to bulk-uncheck the currently displayed achievements.
• Adds a date filter toggle + date picker, and applies date-based filtering during achievement list population.
• Updates SAM.Game and SAM.Picker project files with resource-generation settings and a resources extension package reference.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
SAM.Picker/SAM.Picker.csproj	Adds preserialized resource generation property and System.Resources.Extensions package reference.
SAM.Game/SAM.Game.csproj	Adds preserialized resource generation property and System.Resources.Extensions package reference.
SAM.Game/Manager.Designer.cs	Adds WinForms toolbar controls for “Lock Visible” and date filtering (toggle + picker).
SAM.Game/Manager.cs	Implements date filtering in GetAchievements() and adds event handlers for the new toolbar controls.

Files not reviewed (1)

• SAM.Game/Manager.Designer.cs: Language not supported

Comments suppressed due to low confidence (1)

SAM.Game/Manager.Designer.cs:77

• _ToolStripSeparator2 is instantiated twice (once before _MatchingStringLabel and again later with the other separators). The first instantiation is immediately overwritten and never used; remove the redundant assignment to avoid confusing / fragile designer code.

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