Half-done collections and UI changes

Minor tweaks and refactors. A half-baked collection support and several UI tweaks.

Just committing these are they are "old" changes and the current state turns out to be pretty stable.

Create_DB.sql

@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS Art (
     ID INTEGER PRIMARY KEY generated always as identity,
-    md5_hash CHAR(32) NOT NULL UNIQUE,
+    md5_hash VARCHAR NOT NULL UNIQUE,
     path VARCHAR NOT NULL UNIQUE,
     title VARCHAR,
     link VARCHAR,
@@ -17,13 +17,13 @@ CREATE TABLE IF NOT EXISTS Artist (
 
 CREATE TABLE IF NOT EXISTS Topic (  -- as of yet unimplemented, see Art_Topic
     ID INTEGER PRIMARY KEY generated always as identity,
-    name CHAR(20) UNIQUE NOT NULL,
+    name VARCHAR UNIQUE NOT NULL,
     description VARCHAR
 );
 
 CREATE TABLE IF NOT EXISTS Presence (
-    name CHAR(30) NOT NULL,
-    domain CHAR(20) NOT NULL,
+    name VARCHAR NOT NULL,
+    domain VARCHAR NOT NULL,
     link VARCHAR,
     artist_ID INTEGER NOT NULL,
     PRIMARY KEY (name, domain),
@@ -46,8 +46,8 @@ CREATE TABLE IF NOT EXISTS Art_to_Art_Collection (
 );
 
 CREATE TABLE IF NOT EXISTS Art_to_Presence (
-    presence_name CHAR(20) NOT NULL,
-    presence_domain CHAR(20) NOT NULL,
+    presence_name VARCHAR NOT NULL,
+    presence_domain VARCHAR NOT NULL,
     art_ID INTEGER NOT NULL,
     PRIMARY KEY (presence_name, presence_domain, art_ID),
     FOREIGN KEY (presence_name, presence_domain) REFERENCES Presence(name, domain) ON UPDATE CASCADE ON DELETE CASCADE,
@@ -64,12 +64,12 @@ CREATE TABLE IF NOT EXISTS Artist_to_Topic (  -- TODO implement, meant to indica
 
 CREATE TABLE IF NOT EXISTS  Tag_Category (
     category_id INTEGER PRIMARY KEY generated always as identity,
-    name CHAR(20) NOT NULL
+    name VARCHAR NOT NULL
 );
 
 CREATE TABLE IF NOT EXISTS Tag (
-    tag_ID INTEGER PRIMARY KEY generated always as identity,
-    name CHAR(50) UNIQUE,
+    ID INTEGER PRIMARY KEY generated always as identity,
+    name VARCHAR UNIQUE,
     description VARCHAR,
     category_id SERIAL,
     FOREIGN KEY (category_id) REFERENCES tag_category(category_id)