Improve UI layout, item management, and socket editing

[AdamZ-8113]

Description of the problem being solved:

This PR adds dozens of minor UI/UX enhancements without meaningfully disrupting any of the UIs. Here's the detailed list of changes.

Tree

• Removes the pixel gap across the bottom navigation bar in the Tree view.

Skills

• Quality column now shows an item-specific breakdown of all quality sources for a gem, similar to the tables on the Calcs page
• Adds actions from the Optimise (sockets) button action into undo/redo history.
• The Label field now dynamically updates based on the inferred label or user input
• Shows disabled skills in the gem list.
  • Rather than <No active skills>, we show the name of the disabled skill gem in grey text first, with "no active skills" as a fallback.
  • This is useful for guard skills attached to a trigger/automation, where the guard skill is disabled for calc purposes.
• Updates button sizing, spacing, and layout.
• Labels Imbued Support as (Legacy), makes it grey, moves it below the gem selector, and stops it from highlighting other supports on hover.
• Item socket colors/links can now be updated from the Skills tab, beyond the 'Optimise' button.
• Dialla's Malefaction no longer applies quality bonus to gems that exceed the socket limit (Bug Fix).
• The column header Count: now appears even if the first gem in a group is not a skill gem (Bug Fix).

Items

• Adds search, sorting, and loadout filtering to the full inventory/item list.
• Cleans up the way loadouts are displayed in the item list.
  • Removes the Used by prefix before every loadout name, and now multiple loadouts are listed instead of only the first.
• Item type options in the unique/rare DBs are now filtered based on the slot selected.
  • For example, if the slot is filtered to Weapon 1, we no longer display Amulet in the type drop down, and the type resets if the slot filter is changed.
• Updates item calc tooltip placement and viewport handling.
  • When hovering over an item with many stat comparisons, like a DPS jewel in a build with a dozen jewels, the tooltips are pushed to the right instead of covering the whole screen.
  • When double-clicking the item to add it to the build, the viewport focuses closer to the Add/Save/Cancel buttons, instead of on the far right side. This fixes users having to scroll left constantly.
• Updates socket color and link selectors.
  • They now use smaller arrows so that the W character doesn't clip, and the link selectors use an = style design, instead of checkboxes. This more closely emulates how we display sockets on items.
• Adds support to change socket colors and links in bulk.
• Combines ordinary and catalyst quality editing into one field with an adjacent catalyst selector.
• Expands the width of the influence boxes to avoid clipping influence names.
• Makes minor adjustments to spacing, alignment, and layout.
• Reworks modifier, implicit, corruption, and enchantment dialogs to be more consistent.
  • Fixes issues with spacing, labels clipping, etc.
  • Adds (Legacy) to the labels for Labyrinth enchants on Belts/Gloves/Boots.
• Moves Add Crucible Modifier... into the Add Modifier button with a (Legacy) tag.
• Renames Trade for these items to Item Finder (Weighted Mod Search)....
  • The button explicitly looks for new rares (and a few uniques) with a weighted mod search.
  • The Buy Similar... button is a much better representation of "Trade for these items".

Calcs

• Makes Calcs less cramped, with wider labels and tables and an extra miscellaneous-defence column when space permits.
  • Falls back to the existing layout if the viewport doesn't support it.
• Opens Rage, Charges, Other Avoidance, and Other Ailment Defences expanded by default.

Configuration

• Widens Configuration sections slightly and updates spacing/size/alignment for Set selector, search, and show all configs buttons.
• Gives Custom Modifiers a larger dedicated editing area on the right.
  • Position and size are reverted/adjusted in narrower viewports.
• Increases drop down font size for easier readability without making the boxes taller.

Import/Export

• Updates all 3 panels with more uniform spacing, size, and alignment.
• Updates delete labels to use 'overwrite' for clarity.
• Fixes authentication error message handling.
  • Front end only, no actual changes to any auth code.
• Adds All (Overwrite) to both import routes to import the tree, jewels, equipment, and skills together in fewer clicks.
• Moves Export Support to fit better and renames it Include Support Data

Main UI / View

• Allows starting a new build directly from the build screen with the New button.
  • The button is to the right of Save As so that years of muscle memory aren't disrupted
• Top and Bottom Horizontal Info Bars:
  • Improves spacing/balance, adds some labels, and improves tooltips and narrow viewport layout handling.
• Left Stats Panel/Nav:
  • Increases width a few units to support longer labels like Movement Speed Modifier.
  • Fixes font size, alignment, and spacing in the Main Skill: drop downs, especially for things like minion or channeling skills.
  • Boxes still accommodate the longest known minion attack strings.

This PR should supersede #10292 (items page width)

Steps taken to verify a working solution:

• Full testing suite run many times throughout this iterative process
• Many hours of manual testing for each tab being changed
• Astra-6 Ultra review to look for issues related to code pattern consistency, state management issues, unintended global changes, etc.

Link to a build that showcases this PR:

• Any build will do, but https://pob.codes/b/LjxRdeiAqkw was used for a good amount of my testing.

Before & After Screenshots

This is a non comprehensive set, but showcases the overall intent

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